Information Requests Monitoring System

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Request ID: 182
Request From: Steve Toth
Date Requested: Nov 21, 2007
Request: Note the request for a response to a petition to reduce the PHI for EBDC fungicides on potatoes from 14 to 3 days. Please check with the experts in your respective states and territories (Florida is exempted from this request - see below)and submit your responses to the Southern Region IPM Center Information Requests Monitoring System by December 10, 2007. Thanks. Steve Toth -------------------------------------------------------- Dear IPM Center Directors, Could you ask the indicated states to answer the attached pesticide information request? This request from EPA has evolved from a petition submitted to reduce the PHI for the EBDC fungicides from 14 to 3 days. Some states already have a PHI of 3 days for this use. For this reason, we DO NOT need this question answered for CT, DE, FL, MA, ME, MI, NH, NY, OH, PA, RI, VT, and WI. The information is desired for all other states. Thank you for your help in answering this question. Kent L. Smith, Ph.D. Plant Pathologist USDA, ARS, AO Office of Pest Management Policy Washington, DC (202) 720-3186 kent.smith@ars.usda.gov Pesticide Information Request Active Ingredients: EBDCs Crop: Potato Questions: If the PHI for the EBDCs (maneb, mancozeb, and metiram) on potatoes was changed from 14 to 3 days in your state, providing an additional use window, how would the total usage of EBDCs on potatoes change? If possible, please divide your answer among these three questions: 1) What percent of the current EBDC-treated potato acreage would you expect to receive an additional treatment of an EBDC fungicide during this additional use window? 2) What percent of the potato acreage currently untreated with an EBDC fungicide would you expect to receive treatment with an EBDC fungicide during this additional use window? 3) What is your rationale for your responses to questions 1 and 2? Please Respond to: Kent Smith, Plant Pathologist, USDA Office of Pest Management Policy, kent.smith@ars.usda.gov, voice: 202-720-3186, fax: 202-720-3191 Deadline: Monday, December 10, 2007 Background information: A request has been made to EPA to shorten the pre-harvest interval (PHI) for EBDC fungicides on potatoes in certain states (i.e., states other than CT, DE, FL, MA, ME, MI, NH, NY, OH, PA, RI, VT, WI). The Biological and Economical Affects Division (BEAD) of EPA has been asked to assess the impact of this change on the amount of EBDC use and usage on potatoes in these states. EPA is requesting your assistance, through USDA, in collecting this information. Since the 13 states listed above already have a 3-day PHI, we are only interested in the impact of lowering the PHI from 14 to 3 days in the approximately 23 remaining potato producing states. Specifically we would like to know what this PHI change might do to the total EBDC use and usage. For example, would it simply result in an additional application at the end of the season for 30% of the growers that currently apply an EBDC fungicide and/or would it result in numerous fields not previously treated with an EBDC fungicide being treated. We would also appreciate the rationale(s) for each person’s response. Please include: your name, contact information, state, and association. Thank you

Responses
Responder: Mark Mossler
State: FL
Date Requested: Nov 21, 2007
Not Important/Relevant to my state(s)
Response:

Responder: Darrell Hensley
State: TN
Date Requested: Nov 26, 2007
Not Important/Relevant to my state(s)
Response: The change would not have an effect on Tennessee production. Unless the dollar returns increase for potato production, TN will not be increasing acreage. Most potatoes are grown for personal usage and not on a commercial scale. The only market I see to increase potato production would be the organic market. EBDC use would not be allowed in that market.

Responder: Thomas Campbell
State: NC
Date Requested: Dec 10, 2007
Response: If the PHI for the EBDCs (maneb, mancozeb, and metiram) on potatoes was changed from 14 to 3 days in your state, providing an additional use window, how would the total usage of EBDCs on potatoes change? If possible, please divide your answer among these three questions: 1) What percent of the current EBDC-treated potato acreage would you expect to receive an additional treatment of an EBDC fungicide during this additional use window? PROBABLY NO MORE THAN 10 PERCENT OF THE ACREAGE WHICH PRESENTLY RECEIVES EBDC FUNGICIDE APPLICATION WOULD RECEIVE A SECOND APPLICATION. SPEAKING TO PESTICIDE DEALERS LOCALLY, NINETY PERCENT OF OUR ACRES RECEIVE ONE SPRAY OF AZOXYSTROBIN FOLLOWED BY ONE SPRAY OF CHLOROTHALONIL OR MANCOZEB. WITH OUR IPM EDUCATION PROGRAM IN PLACE FOR OVER 25 YEARS, OUR GROWERS SPRAY LITTLE UNLESS THEIR SCOUTING REVEALS A PROBLEM OR THEIR BUYERS, SUCH AS FRITO LAY, REQUIRE THEM TO SPRAY. EVEN THEN THE TOTAL NUMBER OF SPRAYS USUALLY MIMICS THE SCHEDULE OUTLINED ABOVE. 2) What percent of the potato acreage currently untreated with an EBDC fungicide would you expect to receive treatment with an EBDC fungicide during this additional use window? THREE TO FIVE PERCENT IN MOST YEARS, POSSIBLY TEN PERCENT IN YEARS WITH WET WEATHER AND CONFIRMED OUTBREAKS OF LATE BLIGHT. SEVENTY FIVE PERCENT OF OUR ACREAGE GOES TO CHIPS, SO OUR PRODUCERS HAVE LEARNED OVER THE YEARS THAT LATE BLIGHT CAN BE CONTROLLED BEST IN LATE SEASON BY VINE KILLING SIX TO TEN DAYS BEFORE HARVEST BEGINS. 3) What is your rationale for your responses to questions 1 and 2? OUR IPM EDUCATION HAS OUR GROWERS MAKING INFORMED DECISIONS BASED ON THEIR SCOUTING AND THAT OF HIRED SCOUTS. IF THERE WERE A CONFIRMED CASE OF LATE BLIGHT AND THE WEATHER WAS COOL AND WET IN LATE MAY AND EARLY JUNE (WHICH HAPPENS MORE AND MORE RARELY NOWADAYS) THEN I COULD ANTICIPATE MORE LATE SEASON USE OF A FUNGICIDE WITH ONLY A THREE DAY PHI. Thomas Campbell Extension Agent Pasquotank County

Responder: Paul Guillebeau
State: GA
Date Requested: Dec 10, 2007
Not Important/Relevant to my state(s)
Response: Here is the response from our Extension plant pathologist. Since we have so few potatoes in GA the decision is really not going to affect us too much. We don't have the disease problems either. I think shortening the phi to 3 days would certainly help us should problems arise. ************************************************* David Langston P.O. Box 748 4604 Research Way, Horticulture Building Tifton, GA 31793 phone no. (229)386-7495 FAX no. (229)386-7415

Responder: Henry Fadamiro
State: AL
Date Requested: Jan 15, 2008
Not Important/Relevant to my state(s)
Response:

Responder: Charles Luper
State: OK
Date Requested: Jan 18, 2008
Not Important/Relevant to my state(s)
Response:

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