Information Requests Monitoring System

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Request ID: 196
Request From: Steve Toth
Date Requested: Jan 15, 2010
Request: Note the following request from ted Rogers of USDA OPMP for assistance of pest management specialists in the states/territories for information on dimethoate. Please use the Southern region IPM Center Information Requests Management System to supply a list of contacts for this information. No deadline was given, but I assume the sooner the better. Thanks. Steve Toth ------------------------------------------------ Greetings, We are beginning our discussions of molecules in Registration Review. Over the next several years we will be inquiring of the Centers about levels of use and critical uses of individual molecules. We are beginning the discussion on Dimethoate and would like the assistance of pest management specialists to define crops upon which it is used, percentage crop treated, geographically where it is used, the approximate timing of use and how critical its use is in production of given crops. Over the next several weeks we will be reviewing what information there might be in the Crop Profiles and Pest Management Strategic Plans. In the next several months we will facilitate discussions among specialists, users (commodity groups and farmers), other stakeholders in the Agricultural Community and the registrants. These activities early in the Registration Review process are intended to inform Ag Stakeholders of the potential issues that may arise during review and prepare them to take part in the public aspects of the review process. Thank you for circulating this inquiry to any state specialists who might be interested. Please do not hesitate to contact me if you have any questions or comments. Best, Ted Rogers Biologist, Senior Policy Analyst USDA Office of Pest Management Policy 202-720-3846 ted.rogers@ars.usda.gov

Responses
Responder: Patty Lucas
State: KY
Date Requested: Jan 15, 2010
Response: Contacts for use of Dimethoate in Kentucky - Doug Johnson(doug.johnson@uky.edu)for use on wheat and soybeans. Lee Townsend (lee.townsend@uky.edu)for use with livestock and tobacco or in farm buildings. Ric Bessin (rbessin@email.uky.edu) for use with fruits and vegetables.

Responder: Darrell Hensley
State: TN
Date Requested: Jan 20, 2010
Response: The following information was supplied by Scott Stewart, cotton entomologist. We use dimethoate regularly but not in large amounts in cotton for early season thrips control, as a low cost tank mix partner in treatments for plant bugs and stink bugs, and it does have some utility for suppressing spider mites.

Responder: Holly Gatton
State: VA
Date Requested: Jan 20, 2010
Response: Our pest management specialists, their areas of expertise, and contact info: Rod Youngman, field corn/alfalfa/grass hay/turfgrass, 540-231-9118, youngman@vt.edu; Chris Bergh, tree fruit/grapes/ornamentals, 540-869-2560, cbergh@vt.edu; Doug Pfeiffer, orchards/vineyards, 540-231-4183, dgpfeiff@vt.edu; Rick Fell, honey bees (might be interesting to hear his side since Dimethoate is so toxic to bees), 540-231-7207, rfell@vt.edu; Ames Herbert, soybean/peanut/cotton/small grains, 757-657-6450 x 411, herbert@vt.edu; Tom Kuhar, vegetables, 757-414-0724 x 14, tkuhar@vt.edu; Pete Schultz, nursery/landscape/turf, 757-363-3907, schultzp@vt.edu; Paul Semtner, tobacco, 434-292-5331, psemtner@vt.edu; Allen Straw, vegetables, astraw@vt.edu; Allen Harper, swine, 757-657-6450 x 410, alharper@vt.edu Kyle Peer, Christmas trees, krpeer@vt.edu;

Responder: Mark Mossler
State: FL
Date Requested: Jan 25, 2010
Response: In Florida, dimethoate has several distinct stakeholders in containerized woody ornamentals and citrus. Specifically, the localized system and soluble and soluble nature of dimethoate are useful in controlling sucking insects in woody ornamentals after nicotinoids applied at pot-up have worn off. The other group of stakeholders are citrus growers using the material to control Asian citrus psyllid which is currently actively spreading the citrus greening bacterium throughout the state. Please see the text below from Florida Extension professionals. from Phil Stansly Hi Gene, Dimethoate has become a mainstay for psyllid control in the war on citrus greening. Loss of this product would be huge for Florida citrus growers. Phil Dr. Philip A. Stansly (Phil) Professor of Entomology University of Florida/IFAS Southwest Florida Research and Education Center 2685 State Rd/ 29 N. Immokalee FL 34142 email: pstansly@ufl.edu Tel/FAX (239)658-3400/3469 From Ryan Atwood - Currently being used in citrus primarly for Asian citrus psyllid control. Not super popular, but it is used. Guessing, but maybe 30% use the product. I personally don't think it is a super critical product, but with ACP...rotation is very important, so the more tools the better. Mark, 1. Dimethoate is a very important tool for use in citrus at this time given the spread of citrus greening disease and need for psyllid control. If one was to look back at the past history of dimethoate use in citrus, it might not seem that important 5 years ago, but over the past couple of years, it has become a widely used product for psyllid control because it is very effective. I would estimate that 60% of the Florida citrus acreage gets at least 1 application of dimethoate. Are there any other citrus products currently undergoing EPA review that you need to hear more about? Best Regards, Michael Michael E. Rogers Assistant Professor of Entomology UF / IFAS / Citrus Research and Education Center 700 Experiment Station Road Lake Alfred, FL 33850 phone: 863-956-1151 Fax: 863-956-4631 mobile: 863-661-3303 Email: mrogers@crec.ifas.ufl.edu

Responder: Mark Mossler
State: VI
Date Requested: Jan 25, 2010
Not Important/Relevant to my state(s)
Response:

Responder: Mark Mossler
State: PR
Date Requested: Jan 25, 2010
Response: Dimethoate is a remaining OP that still has a number of food uses in PR due to the age/cost of the material. Generally, pesticides are brought into PR in a large lot and few registrants want to tie up inventory of on-patent materials. Consequently, dimethoate is one of the products still used widely in label sites such as tomato, potato, tropical fruit, melons, peppers, beans, cucurbits, and citrus (where greening was found in October of 2009).

Responder: ples spradley
State: AR
Date Requested: Jan 26, 2010
Response: Very little dimethoate used on Arkansas crops according to our pmsps. Contact IPM coordinator for more information.

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