UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

WASHINGTON D.C., 20460 

APR 2 4 2014 

OFFICE OF CHEMICAL SAFETY 

AND POLLUTION PREVENTION 

MEMORANDUM 

SUBJECT: Revised Usage Report in Support of a Registration Review Preliminary Risk 

Assessment Purposes for the Insecticide Hexythiazox, PC Code# 128849 

FROM: 

THRU: 

TO: 

Jihad Alsadek, Ph.D., Economist .:7 ~~ A- -A~ Science and Information Analysis Branch 

Biological and Economic Analysis Division (7503P) 

Diann Sims, Chief Af-~i,n ~dw--­ Science Information and An sis B;anci; ~ 

Biological and Economic Analysis Division (7503P) 

Molly Clayton, CRM 

Risk Management and Implementation Branch III 

Pesticide Re-Evaluation Division (7508P) 

This memorandum transmits the revised Screening Level Usage Analysis (SLUA) report 

for Hexythiazox. Please refer to the coversheet of the SLUA for an explanation of the data 

sources and other information that describes the report content. Also, please refer to the 

footnotes of the SLUA report for an explanation of symbols used to characterize the data. 

For questions, comments and other usage or label use information requests, please contact 

me at 703-308-8140. · 

cc: Tracy Perry 
Hexythiazox (128849) 

Screening Level Usage Analysis (SLUA) 

Date: April23, 2014 

What is a Screening Level Usage Analysis (SLUA)? 

• Available estimates of pesticide usage data for a particular active ingredient that is used on 

agricultural crops in the United States. 

• Pesticide usage data obtained from various sources. The data are then merged, averaged, and 

rounded so that the presented information is not proprietary, business confidential, or trade secret. 

What does it contain? 

• Pesticide usage data for a single active ingredient only. 

• Agricultural use sites (crops) that the pesticide is reported to be used on. 

• Available pesticide usage information from U.S. states that produce 80% or more of a crop, in most 

cases, or less than 80%, in rare cases, depending on the scope of the survey and available resources. 

• Annual percent of crop treated (average & maximum) for each agricultural crop. 

• Average annual pounds of the pesticide applied for each agricultural crop (i.e., for the states 

surveyed, not for the entire United States). 

What assumptions can I make about the reported data? 

• Average pounds of active ingredient applied- Values are calculated by merging pesticide usage 

data sources together; averaging across all observations, then rounding. Note: If the estimated value 

is less than 500, then that value is labeled <500. Estimated values between 500 & <1, 000,000 are 

rounded to 1 significant digit. Estimated values of 1, 000, 000 or greater are rounded to 2 significant 

digits.) 

• Average percent of crop treated- Values are calculated by merging data sources together; 

averaging by year, averaging across all years, & rounding to the nearest multiple of 5. Note: If the 

estimated value is less than 2. 5, then the value is labeled <2. 5. If the estimated value is less than 1, 

then the value is labeled <1. 

• Maximum percent of crop treated - Value is the single maximum value reported across all data 

sources, across all years, & rounded up to the nearest multiple of 5. Note: If the estimated value is 

less than 2. 5, then the value is labeled <2. 5. 

What are the data sources used? 

• USDA-NASS (United States Department of Agriculture's National Agricultural Statistics Service)-

pesticide usage data from 2004 to 2012. 

• Private pesticide market research- pesticide usage data from 2004 to 2012. 

• California Department of Pesticide Regulation (DPR) Pesticide Use Reporting (PUR) data for 

2004 to 2011. 

What are the limitations to the data? 

• Additional registered uses may exist but are not included because the available surveys do not report 

usage (e.g., small acreage crops). 

• Lack of reported usage data for the pesticide on a crop does not imply zero usage. 

• Usage data on a particular site may be noted in data sources, but not quantified. In these instances, 

the site would not be reported in the SLUA. 

• Non-agricultural use sites (e.g., turf, post-harvest, mosquito control, etc.) are not reported in the 

SLUA. A separate request must be made to receive these estimates. 

• Some sites show some use, even though they are not on the label. This usage could be due to 

various factors, including, but not limited to Section 18 requests, existing stocks ofthe chemical, 

data collection errors, and experimental use permits (EUPs). 
Date: April23, 2014 

Screening Level Estimates of Agricultural Uses ofHexythiazox (128849) 

Sorted Alphabetically 

Reporting Years: 2004-2012 

Average Percent Crop Treated 

Crop 

1 Alfalfa 

2 Almonds 

3 Apples 

4 Apricots 

5 Beans, Green 

6 Caneberries 

7 Cherries 

8 Corn 

9 Dates 

10 Dry Beans/Peas 

11 Grapes 

12 Nectarines 

13 Oranges 

14 Peaches 

15 Pears 

16 Pecans 

17 Plums/Prunes 

18 Pluots * 

19 Potatoes 

20 Strawberries 

21 Sweet Com 

22 Tangerines 

23 Tomatoes 

24 Walnuts 

All numbers are rounded. 

<500: Jess than 500 pounds of active ingredients. 

<2.5: less than 2.5 percent of crop is treated. 

< 1 : less than 1 percent of crop is treated. 

Lbs. A.I. 

<500 

10,000 

1,000 

<500 

<500 

1,000 

<500 

4,000 

<500 

<500 

1,000 

1,000 

1,000 

2,000 

<500 

<500 

1,000 

<500 

1,000 

3,000 

1,000 

1,000 

<500 

3,000 

* Based on CA DPR data only (80% or more of U.S. acres grown are in California) 

NC: not calculated, only pounds a.i. available. 

SLUA data sources include: 

Average 

<1 

10 

<2.5 

5 

<1 

15 

<2..5 

<1 

15 

<1 

<1 

15 

<1 

10 

<2.5 

<1 

5 

NC 

<1 

25 

<2.5 

15 

<1 

5 

USDA-NASS (United States Department of Agriculture's National Agricultural Statistics Service) 

Private Pesticide Market Research 

California DPR (Department of Pesticide Regulation) 

These results reflect amalgamated data developed by the Agency and are releasable to the public. 

Maximum 

<2.5 

20 

5 

10 

<2.5 

25 

10 

<2.5 

15 

<2.5 

<2.5 

20 

<2.5 

15 

10 

<2.5 

15 

NC 

<2.5 

45 

<2.5 

15 

<2.5 

15