Information Requests Monitoring System

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Request ID: 84
Request From: Steve Toth
Date Requested: Jul 22, 2004
Request: Please read the following message from Al Jennings of USDA's Office of Pest Management Policy and forward to Plant Pathologists in your state/territory for their input. USDA needs plant pathologists to identify and refine potential control measures for selected disease agents and vectors listed in the attached table. Note that a response is needed by August 6. Subject: National Plant Disease Recovery System Colleagues, The Homeland Security Presidential Directive addressing food and agriculture requires the development of a National Plant Disease Recovery System capable of responding to high consequence plant diseases with pest control measures and the use of resistant cultivars. The attached table is a very rough first draft attempt at identifying possible controls for the "Select Agents". The purpose of the identification of possible controls is to determine where we need to work with EPA and Registrants to obtain some form of pesticide registration in the event of a disease outbreak. Although some of the chemical controls are identified as "EPA registered", this designation simply means that the compound is registered for some use--not necessarily for the crop or disease in question. I need your help in identifying and refining the potential control measures for the listed select agents and vectors. Could you please ask the plant pathologists and entomologists in your region to take a look at the attached table and offer information and opinions on disease control? I am especially interested in any information about control programs in areas of the world where the disease is endemic. Because we have already developed a strategy for making triazole fungicides available for soybean rust, I don't think we need additional input on that pathogen at this time. I will very much appreciate any information you can provide by August 6. Regards, Al

Responses
Responder: Paul Vincelli
State:
Date Requested:
Response: I certainly endorse seeking the opportunity to use metalaxyl/mefanoxam, should one of the two corn downy mildews listed be introduced. I would expect much better control with that that a contact, especially given the difficulty of acheiving adequate spray coverage in commercial corn fields. Although I don't have direct knowledge with that chemistry on these diseases where they occur, experience with other downy mildews suggests it would be a good choice, at least until resistance might be selected.

Responder: Steve Koenning
State: NC
Date Requested:
Response: I am responsible for Corn, Cotton, and soybean. Under other controls I have listed my comments in quotes. Pathogen: Peronosclerospora philippinensis Disease Name: Philippine downy mildew Crop(s): corn (maize) Chemical Control: triphenyl tin (R), mancozeb (R), fenaminosul (N/R), triorine (R), Metalaxyl (R), Mefenoxam (R) Other Controls: Resistant cultivars (foreign germplasm), drying seed to <12% moisture. "Add Fungicide Chlorothalonil, and others for resistance management." Pathogen: Phakopsora pachyrhizi Disease Name: soybean rust Crop(s): soybeans, other legumes Chemical Control: Chlorothalonil (R), Azoxystrobin (R), Additional chemicals under ยง 18 of FIFRA Other Controls: Scouting, forecasting, modeling Pathogen: Sclerophthora rayssiae var. zeae Disease Name: brown stripe downy mildew Crop(s): corn (maize) Chemical Control: triphenyl tin (R), mancozeb (R), fenaminosul (N/R), triorine (R), Metalaxyl (R), Mefenoxam (R) Other Controls: Resistant cultivars (foreign germplasm), drying seed to <14% moisture. "Add Fungicide Chlorothalonil, and others for resistance management." R = EPA registered pesticide; NR = not registered Steve Koenning Plant Pathologist North Carolina State University

Responder: Mark Mossler
State: FL
Date Requested:
Response: From: L. W. Timmer [mailto:lwt@lal.ufl.edu] Sent: Tuesday, July 27, 2004 11:42 AM To: 'Mark A. Mossler' Subject: RE: Pathogen Info. Mark: Just a few comments now. I work a lot with exotic diseases, so I have some information. Greening disease isn't very well controlled by antibiotics and I doubt if any of the antibiotics would be a practical solution. The same is probably true of canker. In that case, resistance develops pretty quickly. I think it might make more sense to get additional registrations for fungicides that can handle black spot (Guignardia citricarpa), Phaeoramularia leaf and fruit spot, sweet orange scab (Elsinoe australis). Harold Browning and Steve Garnsey have a large project to prioritize the importance of and needs for research on exotic pathogens of citrus. It is funded by the Florida Citrus Production Research Advisory Committee. The results will be up on a website at some point, but I checked with them and it won't be real soon. Let me know if an appraisal of the needs is required and maybe I can help out. Regards, Pete L.W. "Pete" Timmer University of Florida, CREC 700 Experiment Station Rd. Lake Alfred, FL 33850 Phone: 863-956-1151 Fax: 863-956-4631 Web: www.crec.ifas.ufl.edu/timmer -----Original Message----- From: Mark A. Mossler [mailto:MAMossler@ifas.ufl.edu] Sent: Friday, July 23, 2004 9:35 AM To: Tom Kucharek; pdr@ifas.ufl.edu; jbj@ifas.ufl.edu; lwtimmer@ifas.ufl.edu; rhbrlansky@ifas.ufl.edu Subject: Pathogen Info. Hello UF Pathologists, The attachment on this message came from USDA via the Southern Region IPM Center. It asks some questions about assumptions for several pathogens, some with implications for FL (citrus, other legumes, solanaceous crops, rice). As the message states, certain things are registered, but not for the crop. A good example of this is streptomycin for citrus (not labeled - but should it be?). Please provide any input by replying to this message. Regards, Mark Mossler University of Florida IFAS Pesticide Information Office 352-392-4721

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