Information Requests Monitoring System

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Request ID: 153
Request From: Steve Toth
Date Requested: Apr 07, 2006
Request: Please note the following request for information on post-harvest use of malathion on rice. Please forward to the experts in your states and submit any responses to the Southern Region IPM Center Information Requests Monitoring System. Thanks. Steve Toth -------------------------------------- Dear Colleagues: The post-harvest use of malathion on rice is not being supported by the registrant. If this use is to be retained, new residue chemistry data will need to be generated. Malathion applications to grain bins is being supported through reregistration. Please let me know if this use must be retained. If so, I will need to discuss this with the registrant and EPA and perhaps the IR-4 program. Thanks for your assistance. A reply in two weeks will be appreciated. Please do not hesitate to contact me if you have any questions or comments. Best regards, Teung F. Chin, Ph.D. Biological Scientist Office of Pest Management Policy Agricultural Research Service United States Department of Agriculture LOCATED AT: USDA Animal & Plant Health Inspection Service 4700 River Road, Unit 149 (Room 3D-06.8) Riverdale, MD 20737-1237 Phone (301) 734-8943 Fax (301) 734-5992 Teung.F.Chin@usda.gov http://www.ars.usda.gov/opmp

Responses
Responder: Mike Weaver
State: VA
Date Requested: Apr 07, 2006
Not Important/Relevant to my state(s)
Response: Virginia does not grow a significant crop of commercial rice. At one time we had a few wild rice growers, but we bascially have no known crop at this time.

Responder: Darrell Hensley
State: TN
Date Requested: Apr 10, 2006
Response: Very little rice production occurs in Tennessee, Currently this have should have no effect on TN rice production. Very beneficial to have malathion for storage bin applications

Responder: Gus Lorenz
State: AR
Date Requested: Apr 11, 2006
Not Important/Relevant to my state(s)
Response: I know of no uses for this product post harvest.

Responder: Mark Mossler
State: VI
Date Requested: Apr 12, 2006
Not Important/Relevant to my state(s)
Response:

Responder: Mark Mossler
State: PR
Date Requested: Apr 12, 2006
Not Important/Relevant to my state(s)
Response:

Responder: Mark Mossler
State: FL
Date Requested: Apr 12, 2006
Not Important/Relevant to my state(s)
Response: In checking with the one rice mill we have in FL, they use either cyfluthrin, phosphides, or carbon dioxide.

Responder: Charles Luper
State: OK
Date Requested: Apr 18, 2006
Not Important/Relevant to my state(s)
Response: Not important to our state not any rice. Plus our stored products group has not worked with rice much but feels malathion is a very poor option due to resistance issues.

Responder: Glenn Studebaker
State: AR
Date Requested: Apr 20, 2006
Not Important/Relevant to my state(s)
Response: I don't know of any post harvest uses of malathion on rice. I don't see any label that allows post harvest use. Most labels I've looked at currently do not allow malathion use on rice in storage or even on grain bins if rice will be stored there. Glenn Studebaker, Ph.D. Assistant Professor, Extension Entomologist University of Arkansas P.O. Box 48 Keiser, AR 72351 gstudebaker@uaex.edu

Responder: Douglass Stevenson
State: TX
Date Requested: Apr 27, 2006
Response: The registration of malathion for post-harvest use on rice is of little consequence, particularly if grain bin treatment is being addressed through reregistration. The foundation studies by Tomizawa (1960, 1962) and Koivistoinen (1961) pointed out from the beginning that most malathion residues in rice occur from post-harvest application. Other, more effective methods and materials for controlling stored products insects have largely supplanted malathion treatments, reducing both market and marginal returns. It is no surprise that Cheminova does not wish to support post harvest treatments of rice. Douglass E. Stevenson, Ph.D. Extension Associate - Ag Chem Texas Cooperative Extension 115-A Agronomy Field Laboratory, TAMU College Station, TX 77843-2488 ph 979-862-1035 fx 979-845-6251 d-stevenson@tamu.edu http://www-aes.tamu.edu/doug/doug.htm

Responder: Steve Toth
State: NC
Date Requested: Apr 27, 2006
Not Important/Relevant to my state(s)
Response:

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