Imazaquin (128848) and Imazaquin ammonium salt (128840) Screening Level Usage Analysis (SLUA)

Date: March 5 , 2014

What is a Screening Level Usage Analysis (SLUA)?

 Available estimates of pesticide usage data for a particular active ingredient that is use d 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 secr et.
What does it c ontain?

 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 les s 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 observation s, 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 es timated 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 200 4 to 20 1 2

.

 Private pesticide marke t research

– pesticide usage data from 200 4 to 20 1 2

.

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

200 4 to 20 1 1

. What are the limitations to the data?

 Additional registered uses may exist but are not included be cause 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 inst ances, 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 thoug h they are not on the label. This usage could be due to various factors, including, but not limited to Section 18 requests, existing stocks of the chemica l, data collection errors, and experimental use permits (EUPs).Date: March 5 , 2014 Screening Level Estimates of Agricultural Uses of Imazaquin ( 128848 ) and Imazaquin

, ammonium salt (128840) Sorted Alphabetically Reporting Years: 200 4

- 201 2

Average Percent Crop T reated

Crop Lbs. A.I. Applied Annually Av era g e Max imum

1 Soybeans 50,000 <1 <2.5

All numbers are rounded. <2.5: less than 2.5 percent of crop is treated. <1: less than 1 percent of crop is treated.

SLUA data sources include:

USDA

- NASS (United States Department of Agriculture's National Agricul tural Statistics Service)

Private Pesticide Market Research

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