Appendix A. Ecological Effects Data

Comparison of Toxicity of Organisms to different forms of Triclopyr in terms of the acid equivalent (TEA, BEE, & degradate TCP)

Taxa Effect Type Endpoint Triclopyr Acid - TGAI TEA 

(ae)

BEE

(ae)

TCP

(ae)

Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 117 mg/L 79.2 mg/L 0.47 mg/L 1.9 mg/L

Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 148 mg/L 155.4 mg/L 0.26 mg/L 16.1 mg/L

Freshwater fish

Fathead Minnow

(Pimephales promelas)

Chronic

NOEC

LOEC

No Data

> 32.2 mg/L

< 50.2 mg/L

No Data No Data

Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Chronic

NOEC

LOEC

No Data No Data

0.019 mg/L

0.034 mg/L

No Data

Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 132.9 mg/L 346 mg/L 0.25 mg/L 13.4 mg/L

Freshwater invertebrate 

Water flea

(Daphnia magna)

Chronic

NOEC

LOEC

No Data

25 mg/L

46.2mg/L

No Data No Data

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute 14d EC50 No Data 6.1 mg/L 0.86 mg/L Invalid study

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum capricortum)

Acute 5d EC50 29.8 mg/L 12.1 mg/L 2.5 mg/L 2.3 mg/L

Non-vascular aquatic plant

Blue-green algae 

(Anabeana flos-aquae)

Acute 5d EC50 No Data (7d EC50)

4.1 mg/L 1.42 mg/L 2.3 mg/L

Non-vascular aquatic plant 

Freshwater diatom

(Navicula pelliculosa)

Acute 5d EC50 No Data (4d EC50)

10.6 mg/L

0.07 mg/L No Data

Avian

Mallard duck

(Anas platyrhynchos)

Acute oral LD50 1698 mg/kg bw (14d LC50)

1418 mg/kg bw No Data No Data
Taxa Effect Type Endpoint Triclopyr Acid TEA (ae) BEE

(ae)

TCP

(ae)

Avian

Northern bobwhite Quail

(Colinus virginianus)

Acute oral 21d LD50 No Data No Data 529 mg/kg bw (8d LD50)

> 2585 mg/kg bw

Avian

Northern bobwhite Quail

(Colinus virginianus)

Subacute 

dietary 8d LC50 2934 ppm 5,189 ppm 3385 ppm No Data

Avian

Mallard duck

(Anas platyrhynchos)

Subacute 

dietary 8d LC50 No Data > 4,464.8 ppm > 3885 > 7265 ppm

Avian

Mallard duck

(Anas platyrhynchos)

Chronic NOAEC

LOAEC

100 ppm

200 ppm

# of 14 d old survivors

No Data No Data No Data

Rodent 

Rat Acute oral LD50 630 (F) mg/kg 572 (M & F) 

mg/kg 578 (M & F) mg/kg 1026 (M) 

mg/kg

Rodent 

Rat Chronic NOAEL

LOAEL

5 mg/kg bw

25 mg/kg bw No Data No Data No Data

Honeybee 

(Apis mellifera) Acute Contact

48h LD50 >100 μg/bee No Data > 72 μg/bee No Data

Terrestrial dicot 

Sunflower (Helianthus annus)

(Vegetative Vigor)

Acute 14d EC25 No Data

0.005 lbs ae/A

Parameter: shoot 

length

0.006 lbs ae/ A

Parameter: shoot 

weight

No Data

Terrestrial monocot 

Onion (Allium cepa)

(Vegetative Vigor)

Acute 14d EC25 No Data

0.114 lbs ae/A

Parameter: shoot 

weight

0.063 lbs ae/A

Parameter: shoot 

weight

No Data

Terrestrial dicot

Alfalfa (Medicago sativa)

(Seedling Emergence)

Acute 51d EC25 No Data No Data 0.045 lbs ae/A

parameter: emergence

No Data

Terrestrial dicot 

Soybean (Glycine max)

(Seedling Emergence)

Acute 14d EC25 No Data

> 0.23 lbs ae/A

Parameter: shoot 

length

< 8.0 lbs ae/A

Parameter: emergence No Data

Terrestrial monocot 

Onion (Allium cepa) 

(Seedling Emergence)

Acute 51d EC25 No Data

> 0.69 lbs as/A

Parameter: shoot 

length

0.053 lbs ae/A

Parameter: shoot 

weight

No Data
Terrestrial monocot 

Barley (Hordeum vulgare)

(Seedling Emergence)

Acute 14d EC25 No Data

> 0.23 lbs ae/A

Parameter: shoot 

length

< 8.0 lbs ae/A

Parameter: emergence No Data
Triclopyr Acid (colored cells are most sensitive for triclopyr acid)

Habitat Taxa Effect 

Type

Endpoint Value Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author))

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 117 mg/L Practically 

Non-Toxic

Acceptable 00049637 

Dow Chemical 

1973

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 148 mg/L Practically 

Non-Toxic

Acceptable 00049637 

Dow Chemical 

1973

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 132.9 mg/L Practically 

Non-Toxic

Acceptable 40346504

McCarty 1977

Aquatic

plants

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum 

capricortum)

Acute 5d EC50 29.8 mg/L Parameter? Supplemental 41736303

Cowgill 1989

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Acute 

oral

LD50 1698 mg/kg bw Slightly Toxic Acceptable 40346401 

Dow Chemical 

1976

Terrestrial Avian

Cortunix Quail 

Subacute 

dietary

LC50 3272 ppm Slightly Toxic Supplemental 00049638 

Dow Chemical 

1973

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Subacute 

dietary

LC50 2934 ppm Slightly Toxic Acceptable 40346403 

Dow Chemical 

1976

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Subacute 

dietary

LC50 5620 ppm Practically 

Non-Toxic

Acceptable 0031249

Wildlife Int’l 1979

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Chronic NOAEC

LOAEC

LOAEC

500

>500

200

ppm

ppm

ppm

N/A Acceptable 00031251

Beavers 1979

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Chronic NOAEC

LOAEC

100

200

ppm # of 14 d old 

survivors

Acceptable 00031250

Beavers 1979
Habitat Taxa Effect

Type

Endpoint Value Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial Rodent 

Rat

Acute 

oral

LD50 729 (M)

630 (F)

(F 95% CI 450-829) 

mg/kg

mg/kg

mg/kg

Slightly Toxic Acceptable

(HED 2002)

00031940

Henck et al. 1979

Terrestrial Rodent Chronic NOAEL

LOAEL

25

250

mg/kg bw 

mg/kg bw

Reproductive/

Systemic

Acceptable (RED 1998)43545701

Vedula et al. 1995

Terrestrial Rodent Chronic NOAEL

LOAEL

5

25

mg/kg bw 

mg/kg bw

Reproductive/

Offspring

Acceptable

(HED 2002)

43545701

Vedula et al. 1995

Terrestrial Honeybee (Apis mellifera

)

Acute Contact

48h LD50

>100 μg/bee Practically 

Non-Toxic

Acceptable 40356602

Dingledine 1985
TCP (Degradate Toxicity Information)

Habitat Taxa Effect

Type

Endpoint Value 

(expressed as 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 16.1 mg/L Slightly 

Toxic

Acceptable 41829003

Gorzinski et al.

1991

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 16.3 mg/L Slightly

Toxic

Acceptable 41829004

Gorzinski et al.

1991

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 1.9 mg/L Moderately 

Toxic

Acceptable 44585404

Wan et al. 1987

Aquatic Freshwater fish

Coho salmon

Acute 96h LC50 2.3 mg/L Moderately 

Toxic

Supplemental 44585404

Wan et al. 1987

Aquatic Freshwater fish

Chum salmon

Acute 96h LC50 2.3 mg/L Moderately 

Toxic

Supplemental 44585404

Wan et al. 1987

Aquatic Freshwater fish

Sockeye salmon

Acute 96h LC50 3.2 mg/L Moderately 

Toxic

Supplemental 44585404

Wan et al. 1987

Aquatic Freshwater fish

Chinook salmon

Acute 96h LC50 2.7 mg/L Moderately 

Toxic

Supplemental 44585404

Wan et al. 1987

Aquatic Freshwater fish

Pink salmon

Acute 96h LC50 3.5 mg/L Moderately 

Toxic

Supplemental 44585404

Wan et al. 1987

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 13.4 mg/L Slightly

Toxic

Acceptable 41829003

Gorzinski et al.

1991

Aquatic

plants

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute

---- ---- ----

Limited 

critical 

endpoints 

measured

Invalid

45312002

Kirk et al. 2000

Aquatic

plants

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum 

capricortum)

Acute 4d EC50 2.3 mg/L Parameter:

Growth

(Yield)

Supplemental 45312001

Kirk et al. 1999
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic

plants

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum 

capricortum)

Acute 4d NOAEC

(as EC05)

0.84 mg/L Parameter:

Growth

(Yield)

Supplemental 45312001

Kirk et al. 1999

Aquatic

plants

Non-vascular aquatic plant

Blue-green algae 

(Anabeana flos-aquae)

Acute 5d EC50 2.3 mg/L Parameter: 

Growth and 

Reproduction

(Yield)

Supplemental 45312003

Kirk et al. 2000

Aquatic

plants

Non-vascular aquatic plant

Blue-green algae 

(Anabeana flos-aquae)

Acute 5d NOAEC 0.46 mg/L Parameter: 

Growth and 

Reproduction 

(Yield)

Supplemental 45312003

Kirk et al. 2000

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Acute 

oral

8d LD50 > 2585 mg/kg bw Practically 

Non-Toxic

Acceptable 41829001

Campbell et al. 

1990

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Subacute 

dietary

8d LC50 > 7265 ppm Practically 

Non-Toxic

Supplemental 41829002

Long et al. 1990

Terrestrial Rodent 

Rat

Acute 

oral

LD50 1026 (M) 

1124 (F)

mg/kg Slightly Toxic Acceptable 00064938

Gerbig & Emerson 

1970
Triclopyr Triethylamine (TEA) (colored cells are most sensitive for TEA)

Habitat Taxa Effect 

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 273.7

(flow-through)

mg/L Practically 

Non-Toxic

Acceptable 00151956

McCarty 1978

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 233.1 mg/L Practically 

Non-Toxic

Acceptable 00151956

McCarty 1978

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 79.2

(flow-through)

mg/L Practically 

Non-Toxic

Acceptable

(for formulated 

product)

00049637 

Dow Chemical 

1973

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 398.7

(flow-through)

mg/L Practically 

Non-Toxic

Acceptable 00151956

McCarty 1978

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 155.4

(flow-through)

mg/L Practically 

Non-Toxic

Acceptable

(for formulated 

product)

00049637 

Dow Chemical 

1973

Aquatic Freshwater fish

Fathead Minnow

(Pimephales promelas)

Acute 96h LC50 422.8

(flow-through)

mg/L Practically 

Non-Toxic

Acceptable 00151956

McCarty 1978

Aquatic Freshwater fish

Fathead Minnow

(Pimephales promelas)

Acute 96h LC50 168.5

(static)

mg/L Practically 

Non-Toxic

Acceptable 00151958 

Mayes 1983

Aquatic Freshwater fish

Fathead Minnow

(Pimephales promelas)

Acute 96h LC50 86.4

(flow-through)

mg/L Practically 

Non-Toxic

Acceptable 00151958 

Mayes 1983

Aquatic Marine/Estuarine fish

Inland silverside

(Menidia beryllina)

Acute LC50 40.1 mg/L Practically 

Non-Toxic

Acceptable

(for formulated 

product)

41633703 

Ward 1989

Aquatic Freshwater fish

Fathead Minnow

(Pimephales promelas)

Chronic NOEC

LOEC

> 32.2

< 50.2

mg/L

mg/L

Parameter: 

Length

Acceptable 00151958

Mayes 1983

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 463.5 mg/L Practically 

Non-Toxic

Acceptable 00151959

Gerisch 1982
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 346 mg/L Practically 

Non-Toxic

Acceptable 00151956

McCarty 1978

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Chronic NOEC

LOEC

25

46.2

mg/L total young 

and mean 

brood size

Acceptable 00151959

Gerisch 1982

Aquatic Mollusca

Eastern oyster

(Crassostrea virginica)

(shell deposition)

Acute LC50/EC50 18.4 mg/L Slightly Toxic Acceptable 

(for formulated 

product)

42646101

Kowalski 1992

Aquatic Mollusca

Eastern oyster

(Crassostrea virginica)

(embryo larvae)

Acute 48h EC50 > 16.9

< 26.3

mg/L

mg/L

Parameter: 

100% 

abnormal 

development 

at 87 ppm

Acceptable 

(for formulated 

product)

00062623

EG & G 1975

40346606?

Aquatic Crustacea

Pink shrimp

(Penaeus duorarum)

Acute LC50/EC50 270.5 mg/L Practically 

Non-Toxic

Supplemental 00062623

EG & G 1975

40346606?

Aquatic Crustacea

Grass Shrimp 

(Palaemontes pugio)

Acute LC50/EC50 103.7 mg/L Practically 

Non-Toxic

Acceptable 

(for formulated 

product)

42646102

Kowalski 1992

Aquatic Crustacea

Fiddler crab

(Uca pugilator)

Acute LC50/EC50 > 302.2 mg/L Practically 

Non-Toxic

Supplemental 00062623

EG & G 1975

40346606?

Aquatic

plants

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute 14d EC50 6.06 mg/L Parameter: 

Growth and 

Reproduction

Acceptable 41633709

Cowgill 1987

Aquatic

plants

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute 14d EC50 7.6 mg/L Parameter: 

Growth and 

Reproduction

Acceptable 41736302

Cowgill 1988

Aquatic

plants

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum 

capricortum)

Acute 5d EC50 12.1 mg/L Parameter: 

Growth

Acceptable 41736305

Cowgill 1987
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic

plants

Non-vascular aquatic plant

Blue-green algae 

(Anabeana flos-aquae)

Acute 7d EC50 4.1 mg/L Parameter: 

Growth

Acceptable 41633706

Cowgill 1987

Aquatic

plants

Non-vascular aquatic plant 

Freshwater diatom

(Navicula pelliculosa)

Acute 4d EC50 10.6 mg/L Parameter: 

Growth

Acceptable 41633708

Cowgill 1987

Aquatic

plants

Non-vascular aquatic plant 

Marine diatom

(Skeletonema costatum)

Acute 5d EC50 4.6 mg/L Parameter: 

Growth

Acceptable 41633707

Cowgill 1987

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Acute 

oral

14d LD50 1418 mg/kg bw Practically 

Non-Toxic

Acceptable 40346501 

Fink 1978

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Acute 

oral

8d LD50 1417.6 mg/kg bw Practically 

Non-Toxic

Acceptable 00134178

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Subacute 

dietary

8d LC50 5,189 ppm Practically 

Non-Toxic

Acceptable 40346503 

Fink 1978

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Subacute 

dietary

8d LC50 > 4,464.8 ppm Practically 

Non-Toxic

Acceptable 40346502 

Fink 1977

Terrestrial Rodent 

Rat

Acute 

oral

LD50 572 (M & F) mg/kg Slightly Toxic Acceptable 41443301

Mizell & Lomax 

1988

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus) 

(Vegetative Vigor)

Acute 14d EC25 0.0063 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus) 

(Vegetative Vigor)

Acute NOAEC 0.0028 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus)

(Vegetative Vigor)

Acute 14d EC25 0.005 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus)

(Vegetative Vigor)

Acute NOAEC 0.0028 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus) 

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus) 

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Sugarbeet (Beta vulgaris)

(Vegetative Vigor)

Acute 14d EC25 0.030 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Sugarbeet (Beta vulgaris)

(Vegetative Vigor)

Acute 14d EC25 0.11 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Sugarbeet (Beta vulgaris)

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Terrestrial 

Plant

Terrestrial dicot 

Sugarbeet (Beta vulgaris)

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Tomato 

(Lycopersicon esculentum)

(Vegetative Vigor)

Acute 14d EC25 0.0135 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Tomato 

(Lycopersicon esculentum)

(Vegetative Vigor)

Acute 14d EC25 0.018 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial 

Plant

Terrestrial dicot 

Tomato 

(Lycopersicon esculentum)

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Tomato 

(Lycopersicon esculentum)

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Wheat (Triticum aestivum) 

(Vegetative Vigor)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Wheat (Triticum aestivum)

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Wheat (Triticum aestivum)

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Oilseed rape

(Brassica napus)

(Vegetative Vigor)

Acute 14d EC25 0.051 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Oilseed rape

(Brassica napus)

(Vegetative Vigor)

Acute 14d EC25 0.064 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Oilseed rape

(Brassica napus)

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Oilseed rape 

(Brassica napus)

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Radish (Raphanus sativus)

(Vegetative Vigor)

Acute 14d EC25 0.125 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial 

Plant

Terrestrial dicot 

Radish (Raphanus sativus)

(Vegetative Vigor)

Acute 14d EC25 0.132 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Radish (Raphanus sativus) 

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Radish (Raphanus sativus) 

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Corn (Zea mays)

(Vegetative Vigor)

Acute 14d EC25 0.121 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Corn (Zea mays)

(Vegetative Vigor)

Acute 14d EC25 0.32 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Corn (Zea mays)

(Seedling Emergence)

Acute 14d EC25 > 0.23 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Corn (Zea mays)

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Barley (Hordeum vulgare) 

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Barley (Hordeum vulgare) 

(Seedling Emergence)

Acute 14d EC25 > 0.23 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Barley (Hordeum vulgare) 

(Seedling Emergence)

Acute NOAEC 0.230 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Barley (Hordeum vulgare) 

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Barley (Hordeum vulgare) 

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Vegetative Vigor)

Acute 14d EC25 0.114 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Vegetative Vigor)

Acute 14d EC25 0.24 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Seedling Emergence)

Acute 14d EC25 > 0.69 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Vegetative Vigor)

Acute 14d EC25 0.0057 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Vegetative Vigor)

Acute NOAEC 0.0003 lbs ae/A Parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Vegetative Vigor)

Acute 14d EC25 0.028 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Seedling Emergence)

Acute 14d EC25 > 0.23 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Seedling Emergence)

Acute NOAEC 0.0028 lbs ae/A Parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Seedling Emergence)

Acute 21d EC25 < 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Monocots & Dicots 

Veg.Crops (10 Sp.) 

(Vegetative Vigor)

Acute 6 wks EC25 > 9.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990
Triclopyr Butoxyethyl Ester (BEE) (colored cells are most sensitive for BEE)

Habitat Taxa Effect 

Type

Endpoint Value 

(expressed as the 

acid equivalent) 

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 0.47 mg/L Highly Toxic Acceptable 42884501

Woodburn et al. 

1993

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 1.29

(Propylene glycol 

butyl ether)

mg/L Moderately 

Toxic

Acceptable 00134181

Acc# 229783?

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 0.70 mg/L Highly Toxic Acceptable 43442602

Weinberg et al. 

1994

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 24h LC50 0.35-1.2 mg/L Highly to 

Moderately 

Toxic

Supplemental 41971603

Gorzinski 1991

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 1.46

(Propylene glycol 

butyl ether)

mg/L Moderately 

Toxic

Acceptable 00134181

Acc# 229783?

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 0.25 mg/L Highly Toxic Acceptable 42917901

Woodburn et al. 

1993

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 24h LC50 0.59 mg/L Moderately 

Toxic

Supplemental 41971604

Gorzinski 1991

Aquatic Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 0.31 mg/L Highly Toxic Acceptable 43442601

Weinberg et al. 

1994

Aquatic Freshwater fish

Coho Salmon

(Oncorhyncus kissutch)

Acute 96h LC50 0.32-0.33

(yolk-sac fry)

1.0 (juvenile fry)

mg/L

mg/L

Highly Toxic

Moderately 

Toxic

Supplemental 41736304

Barron 1987

Aquatic Freshwater fish

Fathead Minnow

(Pimephales promelas)

Acute 24h LC50 1.7 mg/L Moderately 

Toxic

Supplemental 00151965 

Batchelder 1981

Aquatic Marine/Estuarine fish

Inland silverside

(Menidia beryllina)

Acute 96h LC50 0.32 mg/L Highly Toxic Acceptable 42053901 

Ward 1991
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic Marine/Estuarine fish

Inland silverside

(Menidia beryllina)

Acute 96h LC50 0.34 mg/L Highly Toxic Acceptable

(for formulated 

product)

41969901 

Ward 1991

Aquatic Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Chronic NOEC

LOEC

0.019

0.034

mg/L

mg/L

Very Highly 

Toxic

Parameter: 

growth effects

Acceptable 43230201

Weinberg et al. 

1994

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 1.2 mg/L Moderately 

Toxic

Supplemental 00151963

Batchelder 1980

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 8.63 mg/L Slightly Toxic Acceptable 00151965

47006032

Milazzo 1981

Aquatic Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 0.25 mg/L Highly Toxic Acceptable 43442603

Weinberg et al. 

1994

Aquatic Mollusca

Eastern oyster

(Crassostrea virginica)

(shell deposition)

Acute 96h EC50 0.33

(Species)

mg/L Highly Toxic Acceptable 41971602

Boeri 1991

Aquatic Mollusca

Eastern oyster

(Crassostrea virginica)

(shell deposition)

Acute 96h EC50 0.23 mg/L Highly Toxic Acceptable

(for formulated 

product)

41969903

Boeri 1991

Aquatic Crustacea

Grass Shrimp 

(Palaemontes pugio)

Acute 96h LC50 1.8 mg/L Moderately 

Toxic

Acceptable 41971601

Boeri 1991

Aquatic Crustacea

Grass Shrimp 

(Palaemontes pugio)

Acute 96h LC50 0.77 mg/L Highly Toxic Acceptable

(for formulated 

product)

41969902

Ward 1991

Aquatic

plants

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute 14d EC50 0.86 mg/L Parameter: 

Growth and 

Reproduction

Supplemental

(downgraded)

42719101

Milazzo 1993
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic

plants

Vascular aquatic plant

Duckweed

(Lemna gibba)

Chronic 14d 

NOAEC

< 0.111 mg/L Parameter: 

Growth and 

Reproduction

Supplemental 42719101

Milazzo 1993

Aquatic

plants

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum 

capricortum)

Acute 5d EC50 2.5 mg/L Parameter: 

Growth

Acceptable 41633704, 

42090422

Cowgill & 

Millazzo 1989

Aquatic

plants

Non-vascular aquatic plant

Blue-green algae 

(Anabeana flos-aquae)

Acute 5d EC50 1.42 mg/L Parameter: 

Growth

Acceptable 42721101

Hughes 1993

Aquatic

plants

Non-vascular aquatic plant 

Freshwater diatom

(Navicula pelliculosa)

Acute 5d EC50 0.073 mg/L Parameter: 

Growth

Acceptable 42721102

Hughes 1993

Aquatic

plants 

(BEE)

Non-vascular aquatic plant 

Freshwater diatom

(Navicula pelliculosa)

Chronic 5d NOAEC 0.0014 mg/L Parameter: 

Growth

Acceptable 42721102

Hughes 1993

Aquatic

plants

Non-vascular aquatic plant 

Marine diatom

(Skeletonema costatum)

Acute 5d EC50 0.84 mg/L Parameter: 

Growth

Acceptable 42721103

Hughes 1993

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Acute oral 21d LD50 529 mg/kg bw Practically 

Non-Toxic

Acceptable 41902002

Campbell & Lynn 

1991

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Acute oral 14d LD50 611 mg/kg bw Practically 

Non-Toxic

Acceptable 41902003

Campbell & Lynn 

1991

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Subacute 

dietary

8d LC50 6038 ppm Slightly Toxic Acceptable 00134180

Wildlife Int’l 1978

Terrestrial Avian

Northern bobwhite Quail

(Colinus virginianus)

Subacute 

dietary

8d LC50 3885 ppm Slightly Toxic Acceptable 41905501

Lynn et al. 1991

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Subacute 

dietary

8d LC50 > 6689 ppm Practically 

Non-Toxic

Acceptable 00134179

Wildlife Int’l 1977
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial Avian

Mallard duck

(Anas platyrhynchos)

Subacute 

dietary

8d LC50 > 3885 ppm Practically 

Non-Toxic

Acceptable 41905501

Lynn et al. 1992

Terrestrial Rodent 

Rat

Acute oral LD50 578 (M & F) mg/kg Slightly Toxic Acceptable 40557004

Wall et al. 1987

Terrestrial Honeybee 

(Apis mellifera)

Acute Contact

48h LD50

> 72 μg/bee Practically 

Non-Toxic

Acceptable 41219109

Dingledine 1985

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus) 

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus)

(Vegetative Vigor)

Acute 51d EC25 0.006 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant

Terrestrial dicot 

Sunflower 

(Helianthus annus)

(Vegetative Vigor)

Acute NOAEC 0.028 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant

Terrestrial dicot 

Tomato 

(Lycopersicon esculentum)

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Radish (Raphanus sativus) 

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Seedling Emergence)

Acute 51d EC25 0.053 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995
Habitat Taxa Effect

Type

Endpoint Value 

(expressed as the 

acid equivalent)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial 

Plant (BEE)

Terrestrial monocot 

Onion (Allium cepa) 

(Seedling Emergence)

Acute NOAEC 0.0021 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Vegetative Vigor)

Acute 51d EC25 0.063 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa) 

(Vegetative Vigor)

Acute NOAEC < 0.063 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant

Terrestrial dicot 

Sugarbeet (Beta vulgaris)

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Barley (Hordeum vulgare) 

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Corn (Zea mays)

(Seedling Emergence)

Acute 21d EC25 > 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial monocot 

Wheat (Triticum aestivum)

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot 

Oilseed rape 

(Brassica napus)

(Seedling Emergence)

Acute 21d EC25 < 8.0 lbs ae/A Parameter: 

emergence

Acceptable 41734301

Weseloh & 

Stockdale 1990

Terrestrial 

Plant

Terrestrial dicot

Alfalfa (Medicago sativa)

(Seedling Emergence)

Acute 51d EC25 0.045 lbs/A parameter: 

emergence

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant (BEE)

Terrestrial dicot

Alfalfa (Medicago sativa)

(Seedling Emergence)

Acute NOAEC 0.0026 lbs/A parameter: 

emergence

Acceptable 43650001

Schwab 1995
Triclopyr Butoxyethyl Ester (BEE)/Picloram ethyl ester Mixture 

Habitat Taxa Effect 

Type

Endpoint Value 

(% ai) 

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic

plants

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute 14d EC50

NOEC

6.6

(9.2; 99.8)

1.03

(1.43; 15.9)

(TBEE = 9.2% ai)

mg/L

mg/L

Parameter: 

Growth

(plants)

Acceptable 43230310

Milazzo 1994

Aquatic

plants

Non-vascular aquatic plant

Blue-green algae 

(Anabeana flos-aquae)

Acute 5d EC50 0.20

(0.276; 3.0)

(TBEE = 9.2% ai)

mg/L Parameter: 

Growth

Invalid 43230307

Boeri et al. 1994

Aquatic

plants

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum 

capricortum)

Acute 5d EC50

NOEC

0.32

(0.441; 4.9)

0.211

(0.294; 3.2)

(TBEE = 9.2% ai)

mg/L

mg/L

Parameter: 

Growth

Supplemental 42645901

Hughes et al. 1993

Aquatic

plants

Non-vascular aquatic plant 

Marine diatom

(Skeletonema costatum)

Acute 5d EC50 0.12

(0.166; 1.8)

(TBEE = 9.2% ai)

mg/L Parameter: 

Growth

Invalid 43230304

Boeri et al. 1994

Aquatic

plants

Non-vascular aquatic plant 

Freshwater diatom

(Navicula pelliculosa)

Acute 5d EC50 0.36

(0.50; 5.4)

(TBEE = 9.2% ai) 

mg/L Parameter: 

Growth

Invalid 43230301

Boeri et al. 1994

Terrestrial Honeybee 

(Apis mellifera)

Acute Contact

44h LD50

> 1.62

(> 2.25; > 25)

(TBEE = 9.2% ai)

μg/bee Practically 

Non-Toxic

Acceptable 42625901

Hoxter et al.1992

Terrestrial 

Plant

Terrestrial dicot 

Radish (Raphanus sativus) 

(Vegetative Vigor)

Acute 21 d EC25

NOEL

0.008 

(0.035)

0.0035

(0.015)

(TBEE = 23.5% ai)

lbs ae/A

lbs ae/A

Parameter: 

height

Supplemental 41296501

Weseloh and 

Stockdale 1989

Terrestrial 

Plant

Terrestrial dicot 

Soybean (Glycine max) 

(Vegetative Vigor)

Acute 55 d EC25

NOEL

0.00005 

(0.00021)

0.000026

(0.00011)

(TBEE = 23.5% ai)

lbs ae/A

lbs ae/A

Parameter: 

height

Supplemental 41296501

Weseloh and 

Stockdale 1989
Habitat Taxa Effect 

Type

Endpoint Value 

(% ai) 

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial 

Plant

Terrestrial monocot 

Wheat (Triticum aestivum)

(Vegetative Vigor)

Acute 42 d EC25

NOEL

0.05

(0.21)

0.0146

(0.062)

(TBEE = 23.5% ai)

lbs ae/A

lbs ae/A

Parameter: 

height

Supplemental 41296501

Weseloh and 

Stockdale 1989

Terrestrial 

Plant

Terrestrial dicot

Drybean (Phaseolus vulgaris)

(Seedling Emergence)

Acute 14 d EC25

NOEL

0.0000009

(0.000004)

< 0.000007

(< 0.00003)

(TBEE = 23.5% ai)

lbs ae/A

lbs ae/A

Parameter: 

emergence

Supplemental 41296501

Weseloh and 

Stockdale 1989

Terrestrial 

Plant

Terrestrial monocot 

Onion (Allium cepa)

(Seedling Emergence)

Acute 14 d EC25

NOEL

0.008

(0.035)

0.004

(0.0156)

(TBEE = 23.5% ai)

lbs ae/A

lbs ae/A

Parameter: 

emergence

Supplemental 41296501

Weseloh and 

Stockdale 1989

Terrestrial 

Plant

Terrestrial monocot 

Wheat (Triticum aestivum)

(Seedling Emergence)

Acute 21d EC25

NOEL

0.006

(0.025)

0.02

(0.08)

(TBEE = 23.5% ai)

lbs ae/A

lbs ae/A

Parameter: 

emergence

Supplemental 41296501

Weseloh and 

Stockdale 1989

Terrestrial 

Plant

Terrestrial 

Lima bean (Phaseolus lunatus)

(Seedling Emergence)

Acute 21d EC25

NOEL

0.00003

(0.00004; 0.00042)

(TBEE = 9.2% ai)

lbs ae/A

lbs ae/A

Parameter: 

shoot height

Supplemental 43276601

Schwab 1994

Terrestrial 

Plant

Terrestrial monocot 

Barley (Hordeum vulgare) 

(Seedling Emergence)

Acute 21d EC25

NOEL

0.57

(0.791; 8.6)

(TBEE = 9.2% ai))

lbs ae/A

lbs ae/A

Parameter: 

shoot weight

Supplemental 43276601

Schwab 1994
Combined –Most sensitive when converted to acid equivalent (Acid, TEA or BEE)

Habitat Taxa Effect

Type

Endpoint Form 

Tested

Value 

(acid equivalent)

Value

(Original Value)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic 

(BEE)

Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 F (Garlon 4)

62.9% ai 

TBEE

0.32 0.44 mg/L Highly Toxic Acceptable 43442601

Weinberg et al. 

1994

Aquatic 

(BEE)

Freshwater fish

Bluegill sunfish

(Lepomis macrochirus)

Acute 96h LC50 TGAI

96.98% ai

TBEE

0.26 0.36 mg/L Highly Toxic Acceptable 42917901

Woodburn et al. 

1993

Aquatic 

(BEE)

Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 F (Garlon 4)

62.9% ai

TBEE

0.70 0.98 mg/L Highly Toxic Acceptable 43442602

Weinberg et al. 

1994

Aquatic 

(BEE)

Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Acute 96h LC50 TGAI 

96.98% ai

TBEE

0.47 0.65 mg/L Highly Toxic Acceptable 42884501

Woodburn et al. 

1993

Aquatic 

(BEE)

Freshwater fish

Rainbow Trout

(Oncorhynchus mykiss)

Chronic NOEC

LOEC

TGAI

96.98% ai

TBEE

0.019

0.034

0.0263

0.048

mg/L Very Highly 

Toxic

Parameter: 

growth effects

Acceptable 43230201

Weinberg et al. 

1994

Aquatic 

(TEA)

Freshwater fish

Fathead Minnow

(Pimephales promelas)

Chronic NOEC

LOEC

F

44.9% ai

TEA

> 32.2

<50.2

>46.7

(>104) 

<72.7

(<162)

mg/L Parameter: 

Length

Acceptable 00151958

Mayes 1983

Aquatic 

(BEE)

Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 F (Garlon 4)

62.2% ai

TBEE

0.25 0.35 mg/L Highly Toxic Acceptable 43442603

Weinberg et al. 

1994

Aquatic 

(BEE)

Freshwater invertebrate 

Water flea

(Daphnia magna)

Acute 48h EC50 TGAI

96.4% ai

TBEE

1.2 1.7 (nominal) mg/L Moderately 

Toxic

Supplemental 00151963

Batchelder 1980

Aquatic 

(TEA)

Freshwater invertebrate 

Water flea

(Daphnia magna)

Chronic NOEC

LOEC

F 

44.9% ai

TEA

25

46.2

36.2

(80.7)

66.9

(149.0) 

mg/L total young 

and mean 

brood size

Acceptable 00151959, 

42090411, 

92189013

Gerisch 1982

Aquatic

plants 

(BEE)

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute 14d EC50 TGAI

96.98% ai 

TBEE

0.86 1.2 mg/L Parameter: 

Growth and 

Reproduction

Supplemental 42719101

Milazzo et al. 

1993
Habitat Taxa Effect

Type

Endpoint Form 

Tested

Value 

(acid equivalent)

Value

(Original Value)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Aquatic

plants 

(BEE)

Duckweed 

(Lemna gibba)

Chronic 14d 

NOAEC

TGAI

96.98% ai 

TBEE

< 0.111 < 0.155 mg/L Parameter: 

Growth and 

Reproduction

Supplemental 42719101

Milazzo et al. 

1993

Aquatic

plants 

(TEA)

Vascular aquatic plant

Duckweed

(Lemna gibba)

Acute 14d EC50 F 

44.9% ai

TEA

6.1 8.8

(19.5)

mg/L Parameter: 

Growth and 

Reproduction

Acceptable 41633709

Cowgill 1987

Aquatic

plants 

(BEE)

Non-vascular aquatic plant 

Freshwater diatom

(Navicula pelliculosa)

Acute 5d EC50 TGAI

96.98% ai

TBEE

0.073 0.102 mg/L Parameter: 

Growth

Acceptable 42721102

Hughes 1993

Aquatic

plants 

(BEE)

Non-vascular aquatic plant 

Freshwater diatom

(Navicula pelliculosa)

Chronic 5d 

NOAEC

TGAI

96.98% ai

TBEE

0.0014 0.002 mg/L Parameter: 

Growth

Acceptable 42721102

Hughes 1993

Aquatic

plants 

(TEA)

Non-vascular aquatic plant

Blue-green algae 

(Anabeana flos-aquae)

Acute 7d EC50 F

45% ai

TEA

4.1 5.9 mg/L Parameter:

Growth

Acceptable 41633706

Hughes 1987

Aquatic

plants

(BEE)

Non-vascular aquatic plant 

Green algae

(Kirchneria subcapitata)

(Formerly Selenastrum 

capricortum)

Acute 5d EC50 F

61.3% ai

TBEE

2.5 3.4

(5.6)

mg/L Parameter:

Growth

Acceptable 41633704, 

42090422

Cowgill & 

Millazzo 1989

Terrestrial 

(BEE)

Avian

Northern bobwhite Quail

(Colinus virginianus)

Acute 

oral

21d LD50 TGAI 

96.1% ai

TBEE

529 735 mg/kg bw Practically 

Non-Toxic

Acceptable 41902002

Campbell & 

Lynn 1991

Terrestrial 

(BEE)

Avian

Northern bobwhite Quail

(Colinus virginianus)

Acute 

oral

14d LD50 F (Garlon 4)

62.9% ai

TBEE

611 849 

(1350)

mg/kg bw Practically 

Non-Toxic

Acceptable 41902003

Campbell & 

Lynn 1991

Terrestrial 

(Acid)

Avian

Northern bobwhite Quail

(Colinus virginianus)

Subacute 

dietary

LC50 TGAI

Acid

2934 2934 ppm Slightly Toxic Acceptable 40346403 

Dow Chemical 

1976

Terrestrial 

(BEE)

Avian

Northern bobwhite Quail

(Colinus virginianus)

Subacute 

dietary

8d LC50 TGAI

96.1% ai

TBEE

3885 5401 ppm Slightly Toxic Supplemental 41905501

Lynn et al. 1991

Terrestrial 

(BEE)

Avian

Mallard duck

(Anas platyrhynchos)

Subacute 

dietary

8d LC50 TGAI

96.1% ai

TBEE

> 3,885 > 5,401 ppm Practically 

Non-Toxic

Acceptable 41905502

Lynn et al. 1992
Habitat Taxa Effect

Type

Endpoint Form 

Tested

Value 

(acid equivalent)

Value

(Original Value)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial

(Acid)

Avian

Mallard duck

(Anas platyrhynchos)

Chronic NOAEC

LOAEC

TGAI

98.9% ai

Acid

100

200

100

200

ppm # of 14 d old 

survivors

Acceptable 00031250

Beavers & Fink 

1980

Terrestrial

(Acid)

Avian

Northern bobwhite Quail

(Colinus virginianus)

Chronic NOAEC

LOAEC

LOAEC

TGAI

98.9% ai

Acid

500

>500

200

500

>500

200

ppm

ppm

ppm

No sign. 

reproductive 

impairment

Acceptable 00031251

Beavers & Fink 

1979

Terrestrial 

(Acid)

Rodent 

Rat

Acute 

oral

LD50 TGAI 

Acid

729 (M)

630 (F)

729 (M)

630 (F)

mg/kg Slightly Toxic Acceptable 00031940

Henck et al. 1979

Terrestrial 

(TBEE)

Rodent 

Rat

Acute 

oral

LD50 TGAI 

96% ai

TBEE

578 (M &F) 803 (M & F) mg/kg Slightly Toxic Acceptable 40557004

Wall et al. 1987

Terrestrial 

(TEA)

Rodent 

Rat

Acute 

oral

LD50 TGAI 

44.9 % ai

TEA

572 (M &F) 1847 (M & F) mg/kg Slightly Toxic Acceptable 41443301

Mizell & Lomax 

1988

Terrestrial 

(Acid)

Rodent Chronic NOAEL

LOAEL

TGAI

99.4% ai

Acid

25

250

25

250

mg/kg bw 

mg/kg bw

Reproductive/

Systemic

Acceptable

(RED 1998)

43545701

Vedula et al 1995

Terrestrial 

(Acid)

Rodent Chronic NOAEL

LOAEL

TGAI 

99.4% ai

Acid

5

25

5

25

mg/kg bw 

mg/kg bw

Reproductive/

Offspring

Acceptable

(HED 2002)

43545701

Vedula et al 1995

Terrestrial 

(Acid)

Honeybee 

(Apis mellifera)

Acute Contact

48h LD50

TGAI

99.2% ai

Acid

>100 >100 μg/bee Practically 

Non-Toxic

Acceptable 40356602

Dingledine 1985

Terrestrial 

(BEE)

Honeybee 

(Apis mellifera)

Acute Contact

48h LD50

TGAI

97.7% ai

TBEE

> 72 > 100 μg/bee Practically 

Non-Toxic

Acceptable 41219109

Dingledine 1985

Terrestrial 

Plant (TEA)

Terrestrial dicot 

Sunflower 

(Helianthus annus)

(Vegetative Vigor)

Acute 14d EC25 F

46.2% ai

TEA

0.005 0.0076 lbs/A parameter: 

shoot length

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant (BEE)

Terrestrial dicot 

Sunflower 

(Helianthus annus)

(Vegetative Vigor)

Acute 51d EC25 F (Garlon 4)

62.2% ai

TBEE

0.006 0.0089 lbs/A parameter:

shoot weight

Acceptable 43650001

Schwab 1995
Habitat Taxa Effect

Type

Endpoint Form 

Tested

Value 

(acid equivalent)

Value

(Original Value)

Unit Toxicity 

category

Study 

Classification

Source 

(MRID or Acc#, 

author)

Terrestrial 

Plant (BEE)

Terrestrial monocot 

Onion (Allium cepa) 

(Vegetative Vigor)

Acute 51d EC25 F (Garlon 4)

62.2% ai

TBEE

0.063 0.0888 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant (TEA)

Terrestrial monocot 

Onion (Allium cepa) 

(Vegetative Vigor)

Acute 14d EC25 F

46.2% ai

TEA

0.114 0.166 lbs/A parameter: 

shoot weight

Acceptable 43129801

Schwab 1993

Terrestrial 

Plant (BEE)

Terrestrial dicot

Alfalfa (Medicago sativa)

(Seedling Emergence)

Acute 51d EC25 F (Garlon 4)

62.2% ai

TBEE

0.045 0.0622 lbs/A parameter: 

emergence

Acceptable 43650001

Schwab 1995

Terrestrial 

Plant (BEE)

Terrestrial monocot 

Onion (Allium cepa) 

(Seedling Emergence)

Acute 51d EC25 F (Garlon 4)

62.2% ai

TBEE

0.053 0.0732 lbs/A parameter: 

shoot weight

Acceptable 43650001

Schwab 1995