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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

WASHINGTON D.C., 20460 

DP Barcode: D423458

PC Code: 098301

July 9, 2015 

MEMORANDUM 

Subject: Tier II Terrestrial Plant Toxicity Study for Aldicarb 

To: Susan Bartow, Chemical Review Manager 

Kevin Costello, Acting Branch Chief 

Risk Management and Implementation Branch 4 

Pesticide Re-Evaluation Division (7508P) 

From: N.E. Federoff, Wildlife Biologist 

Environmental Risk Branch 2 

Environmental Fate and Effects Division 

Office of Pesticide Programs (7507P) 

Through: Brian Anderson, Branch Chief 

Environmental Risk Branch 2 

Environmental Fate and Effects Division 

Office of Pesticide Programs (7507P) 

The following ecotoxicity data have now been reviewed and the results are presented below. 

New Ecological Toxicity Data for Aldicarb 

Study Type Species

Describe effect (i.e. 

mortality, growth, 

reproduction)

Toxicity Value

Reference

Study Classification

Tier II Terrestrial Plant 

Seedling 

Emergence

TEMIK 15G

Ryegrass and Tomato Growth No effects

NOAEC = 33 lbs ai/A

49477401

Acceptable
MRID 494774-01

Temik 15G: Seedling Emergence Test

Guideline: 850-4100 

The effect of Aldicarb (TEMIK 15G) on the seedling emergence of one monocot crop (perennial 

ryegrass, Lolium perenne) and one dicot crop (tomato, Lycopersicon esculentum) was studied at 

nominal concentrations of 0 (negative control) 2.1, 4.1, 8.3, 17 and 33 lb ai/A. Aldicarb was 

applied as a granular formulation. 

The growth medium used in the seedling emergence test was a mixture of 70% sand and 30% 

loam (pH and % organic carbon were not reported; % organic matter 1.9%). On day 14 the 

surviving plants per pot were recorded and cut at soil level for measuring the plant height and 

dry weight. 

Emergence in the negative control ranged from 75-100% for perennial ryegrass and from 50-

100% for tomato. There were no statistically adverse differences in the treated group compared 

to the negative control for any species. 

The reviewer determined survival based on the number planted. Based on the reviewer’s results, 

survival in the negative control group was 87.5% for perennial ryegrass and 92.5% for tomato. 

Survival in the treatment groups ranged from 70-95% for perennial ryegrass and from 82.5 –

95% for tomato. 

No significant effects on height or weight were observed for either species studied.

The most sensitive monocot and dicot species could not be determined due to a lack of toxicity 

and because only one monocot and one dicot species was studied. The study resulted in a 

NOAEC value of 33 lb ai/A for both perennial ryegrass and tomato. An EC/IC25 could not be 

determined for either species. 

There were no phytotoxic effects in this study for any species in the treatment groups compared 

to the negative control. 

Maximum Labeled Rate: 33 lb a.i./A 

Results Synopsis

Most sensitive monocot: Could not be determined

EC50/IC50: Could not be determined 95% C.I.: N/A

EC25/IC25: Could not be determined 95% C.I.: N/A
EC05/IC05: Could not be determined 95% C.I.: N/A

Slope: NC 95% C.I.: N/A

NOAEC: 33 lb a.i./A 

Most sensitive dicot: Could not be determined

EC50/IC50: Could not be determined 95% C.I.: N/A

EC25/IC25: Could not be determined 95% C.I.: N/A

EC05/IC05: 33 lb a.i./A (tomato biomass) 95% C.I.: 8.73-74.1 lb a.i./A

Slope: NC 95% C.I.: N/A

NOAEC: 33 lb a.i./A

This study is scientifically sound and is classified as acceptable.

Table 1 (Tier II studies). Summary of most sensitive parameters by species (lb ai/A).

Species Endpoint NOAEC EC05 EC25 EC50

Perennial 

Ryegrass

None 33 NC NC NC

Tomato None 33 NC NC NC