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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON D.C., 20460

DP Barcode: D423458 PC Code: 098301 July 9

, 201 5 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 (750 7P)

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 4 9477401

AcceptableMRID 49 4774

- 01

Temik 15G : Seedling Emergence Test

Guideline: 850

- 4 10 0

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% s and 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 re viewer’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/IC 25 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

EC 50 /IC 50 : Could not be determined 95% C.I.: N/A

EC 25 /IC 25 : Could not be determined 95% C.I.: N/AEC 05 /IC 05 : 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

EC 50 /IC 50 : Could not be determined 95% C.I.: N/A

EC 25 /IC 25 : Could not be determined 95% C.I.: N/A

EC 05 /IC 05 : 33 lb a.i./A (tomato biomass) 95% C.I.: 8.73

- 74.1 lb a.i./A

Slope: N C 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 EC 05 EC 25 EC 50

Perennial Ryegr ass None 33 NC NC NC

Tomato None 33 NC NC NC