1.



# 1 0 7,01/Pii3 Jason Fearneyhough, 

### Director Matthew H. Mead, 

### Governor

2219 Carey Ave. • Cheyenne, WY 82002 

# N

DEPARTMEN

- 1 

# ffliatverit/I.e

, Phone: (307) 777-7321 • Fax: (307) 777-6593

Web: agriculture.wy.gov • Email: wdal®state.wy.0

The Wyoming Department ofAgriculture is dedicated to the promotion and enhancement of Wyoming's agriculture, natural resources and quality oflift.



### January 14, 2013

Attention: Team Leader —Debra Rate (Team 9)

Risk Integration, Minor Use & Emergency Response

U.S. EPA Office of Pesticide Programs (7505P)

One Potomac Yard, Room 54900,

2777 Crystal Drive

Arlington, VA 22202

(703) 305-6784

RE: Re-certification for an emergency exemption for the use of Dimilin 2L (diflubenzuron, EPA

Reg. #400-461) on alfalfa/hay crops to control Mormon cricket and various grasshopper species

Section 18 of the amended FIFRA provides the Administrator may exempt a state or federal

agency from provisions of FIFRA if a determination is made that emergency conditions exist that

require such exemption. The Wyoming Department of Agriculture (WDA) is applying for recertification for a specific exemption of Dimilin 2L (diflubenzuron, EPA Reg. #400-461) on

alfalfa/hay crops to control Mormon cricket and various grasshopper species in Wyoming. This

is the fourth year that WDA has made this request. All previously submitted material remains

valid as per 40CFR 166.20(b)(5)

ncerely,

Polly Cross

Assistant Manager, 

### Technical Services

Equal Opportunity in Employment and Services

BOARD MEMBERS

Vacant, District I • Jim Hodder, District 2 • Shaun Sims, &oriel 3 • John Moore, District 4 • Alison Lass, Dictriet 5

Bryan Brost, District 6 • Jim Price, Jr., District 7

YOUTH BOARD MEMBERS

Patrick 7immerer Snntheact • Dalin Winter

, : NnrtInstrat • Inhn Manama Snnthweet • Pricker Williams Northeaat

# WYOMING WEED AND PEST COUNCIL

(WWPC)

GOVERNOR, Matt Mead PRESIDENT, John Watson

__________________________________________________________________________________________ 6607 Campstool Road - Cheyenne, WY 82002-0100 - (307) 777-6585 or 1195 South Guernsey Road – Wheatland, WY 82201

_______________________________________________________________________________________________________________________________ ________ Executive Directors

Slade Franklin

State Coordinator, Cheyenne

Jim Cotterman

Secretary, Wheatland Walt Hartung

Area 1, Cody

Quade Schmelzle

Area 2, Gillette Wes Waters Vice President

Area 3, Evansville

Doug Vickrey

Area 4, Daniel Randy Laughter

Area 5, Green River

Lindsay Wheat, Treasurer

Area 6, Laramie January 8, 2013

Wyoming Department of Agriculture

Attn: Polly Cross

– Tech. Services Asst. Manager

6607 Campstool Road

Cheyenne, WY 82002

Mrs. Cross,

On behalf the Wyoming Weed and Pest Council, I would like to request the Wyoming Department of

Agriculture to seek an approval of a Section 18 label for the use of Dimilin to control grasshoppers in

alfalfa. The twenty

‐ three Weed and Pest Control Districts in the state work diligently in assisting private,

state and federal land managers in controlling grasshoppers on their respective grounds. This Section 18

label for Dimilin has historically been an important tool for them in succeeding with their control

programs.

In Wyoming, grasshoppers have been a significant issue over the last three years. In 2010 and 2011, the

state experienced higher than average hatches in most parts of the state. Unmanaged, they would have

had a significant impact on the ecological health of rangeland and croplands both, not to mention a

significant economical impact on the agricultural community. Through the use of insecticides, mainly

Dimilin, the Weed and Pest Control Districts were able to mitigate their impacts and save the agriculture

community from losses estimated near $11 million dollars for 2010. A key to that success was the

Section 18 label for the use of Dimilin on alfalfa. Alfalfa proved to be a major hatching area for the

grasshoppers, and Dimilin was the only insecticide available that would allow the Districts to mitigate

the issue BEFORE the grasshoppers could significantly damage the alfalfa field.

Although we are not expecting grasshopper outbreaks even near the 2010 and 2011 levels, there are

several areas where we expect higher than normal hatches to occur. Some of these areas will have

alfalfa fields within them. The approval of this Section 18 label will help the Weed and Pest Control

Districts to prepare and implement management programs that will mitigate the impacts from any

outbreaks.

Sincerely,

John Watson

PresidentDIMILIN® is a Registered Trademark of Chemtura Corporation, 199 Benson Road, Middlebury, CT 06749

All applicable directions, restrictions, and precautions on the registered product label for

Dimilin 2L (400-461) are to be followed.

These Use Directions must be in the possession of the user at the time of the pesticide application. 003 It is a violation of Federal law to use this product in a manner inconsistent with its labeling.



### FOR CONTROL OF GRASSHOPPERS AND MORMON CRICKETS IN ALFALFA AND MIXED GRASS/ALFALFA HAY

SITES AND ACREAGE TO BE TREATED:



## ALFALFA AND MIXED GRASS/ALFALFA HAY

GRASSHOPPERS AND MORMON CRICKETS: For optimum results, apply DIMILIN 2L when grasshoppers/Mormon crickets have reached the 2 nd to 3 rd

instar stage of development. DIMILIN will not effectively control grasshoppers and Mormon crickets once they reach the adult st age.

Do not exceed 2 fl. oz. per cutting or 4 fl. oz per acre per year.

Do not apply closer than 14 days prior to harvest.

Do not apply DIMILIN directly to or allow to drift to water or wetlands. When disposing of equipment wash water or rinsate, do not contaminate water.

Do not plant food or feed crops in DIMILIN treated soils within 1 month following last application, unless DIMILIN is authorize d for use on these crops.

Do not enter or allow workers into treated area during the restricted entry interval (REI) of 12 hours.

Do not apply within 25 feet by ground or within 150 feet by air of bodies of water such as lakes, reservoirs, rivers, permanent streams, natural ponds,

marshes or estuaries. All applications must include a 25 foot buffer vegetative strip within the buffer zone to decrease runoff

. 

## SECTION 18 EMERGENCY EXEMPTION FOR ALFALFA AND MIXED GRASS/ALFALFA HAY

FOR USE ONLY WITHIN THE STATE OF WYOMING



# RESTRICTED USE PESTICIDE

Due to toxicity to aquatic invertebrate animals.

For retail sale to and use only by Certified Applicators, or persons under their direct

supervision, and only for those uses covered by the Certified Applicator's certification. 

# Dimilin ® 

# 2L

INSECT GROWTH REGULATOR

SUSPENSION CONCENTRATE

Crops Pests Application Rate

(fl oz/acre) Application Timing

Alfalfa and Mixed

Grass/Alfalfa Hay Grasshopper 0.75 - 2 Use 1 application on early instar (majority in the 2nd through 4th instar nymphal stages).

For best results use high rate on heavy infestations or dense foliage.

Mormon

cricket May be used in a RAATs (Reduced Area and Agent Treatment) application on early instars. A RAATs application is an IPM strategy that takes advantage of grasshopper movement and conservation biological control to allow Dimilin 2L to be applied on a reduced

treated area and at reduced rates, while sustaining acceptable control.

The rate range to use per acre and amount of area treated will depend on grasshopper/

Mormon cricket age, plant canopy and topography. Skip up to 50% of the infested area

(every other swath) and use the lower rate under uniform topography with early instar

ages and sparse vegetation. If the majority of the population is late instars, vegetation

is dense, terrain is considered rough, and conditions are hot during treatment, then the

coverage and rate of DIMILIN 2L should be increased up to a blanket (100%) coverage

with 1 fl oz per acre.

Applications may be made after each cutting of alfalfa. Do not apply more than three

applications per year.

DIMILIN will not effectively control grasshoppers and Mormon crickets once they reach the adult stage

Aerial application: For low/high volume application, apply in 2 to 10 gallons of water per acre. For ULV application, apply in a minimum of 12 fl. o zs. total volume per acre.

Ground application: For low/high volume application, apply in 2 to 30 gallons of water per acre. For ULV application, apply in a minimum of 12 fl. o zs. total volume per acre.

Regardless of application type, total spray volume used must ensure thorough coverage of the target crop. Aerial and ULV spray mixtures should

include an evaporation/drift retardant product at use rates prescribed on the specific product label, particularly when conditio ns are favorable for

water evaporation (e.g., high air temperature and/or low humidity). When using oil type evaporation/drift retardant products, b e sure to maintain a

ratio of at least 2 parts water to 1 part oil.

For low volume and ULV applications, make sure that the spray mixture in the boom contains the correct concentration of Dimilin 2L before application begins, and be sure that good agitation is maintained throughout mixing and application.JOB/C406 Chemtura Corporation

199 Benson Road

Middlebury, CT 06749

203-573-2454 tel



### January 3, 2012

Wyoming Dept. of Agriculture

Technical Services

2219 Carey Avenue

Cheyenne, Wyoming 82002-0100

Attention: Polly Cross, Assistant Manager

Subject: Letter of Support for Emergency Exemption, Section 18

For Dimilin® 2L on Alfalfa in Wyoming

Dear Ms. Cross,

Chemtura Corporation supports the State of Wyoming Section 18 application for

the use of Dimilin 2L, EPA Reg. No. 400-461, on alfalfa hay and mixed grass/alfalfa hay

for control of grasshoppers and Mormon cr ickets. Chemtura agrees to supply

commercially ready product via our normal channels of trade.

We would appreciate it if you would se nd us a copy of all EPA correspondence

on this subject to Terri Hass at the above a ddress. Should you have any questions, please

call Terri at 203-573-2462 or e-mail Terri at terri.hass@chemtura.com

.

Sincerely,

Chemtura Corporation

Allen R. Blem

Product Registration Mgr., North America