Information Requests Monitoring System

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Request ID: 164
Request From: Steve Toth
Date Requested: Oct 25, 2006
Request: Note the following request for information regarding the labeled rate of malathion on blueberries. Please forward this request to the experts in your respective states/territories and submit any replies to the Southern Region IPM Center Information Requests Monitoring System by Friday, November 3, 2006. Thanks. Steve Toth ---------------------------------------------------------------- We are nearing the final label decisions for malathion. EPA previously proposed 1.25 lb ai/acre, three applications. Minimum Application Interval 7 days, PHI - one day EPA is NOW supportive of rate if 2 lb ai/acre, two applications for blueberries. Minimum Application Interval 7 days, PHI - one day. This will meet the needs of growers in the Pacific Northwest. But EPA does not wish to authorize a split label which would also permit 2 lbs , two applications AND 1.25 lb ai/acre, three applications unless it is necessary. Minimum Application Interval 7 days, PHI - one day Would a single 2 lb rate, two applications be acceptable to blueberry growers? Your feedback as soon as possible is desirable. Thanks in advance, as always! 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

Responder: Darrell Hensley
State: KY
Date Requested: Oct 27, 2006
Response: Kentucky would still need the three applications as this is the only product that has a 1 day or less phi and provides some control of Japanese beetle. I would push for the split label. Ric Bessin

Responder: Elena Garcia
State: AR
Date Requested: Oct 27, 2006
Response: According to the blueberry crop profile, 20% of the blueberry plantings were treated with malathion in 2002 and the average number of applications was one. So, I do not think restricting to two applications will have much effect in the industry. Elena

Responder: Henry Fadamiro
State: AL
Date Requested: Oct 30, 2006
Response: Specialists at Auburn (e.g. Robert Boozer) and Mississippi State (e.g. Randy Akridge and John Braswell) agree that 1.25 lb ai (3) times would be most beneficial to growers in Alabama and Mississippi.

Responder: Robert (Bob) Bellinger
State: SC
Date Requested: Nov 01, 2006
Response: This comment is from our largest blueberry grower and the only response to my query on this issue: Bob, For Southeastern growers that grow Rabitteye blueberreies the 1.25 schedule would be preferrable. they mature over 6 to 8 weeks and at 2 week intervals that would give us more options. we are talking two species of fruit worms, Jap beetles, June Beetles, stink bugs, blueberry maggot and resistance management. I personally have not had to use it but a few times but when I needed it ...I needed it. Hope this helps. Walker

Responder: Mark Mossler
State: FL
Date Requested: Nov 02, 2006
Response: Florida has approximately 3,000 acres of blueberries planted. About three-quarters of this is southern highbush and the rest rabbiteye. We have an extended season, so three applications is the most appropriate for the state. Since the amount of malathion being proposed per year is approximately 4 pounds, the label should be worded to the following extent "Do not make more than 3 applications per year" and "Do not use more than 4 lbs ai/acre/year." These caveats would allow maximum flexibility as current recommendations are no more than 2 lb ai/A for any one pest type.

Responder: Mark Mossler
State: PR
Date Requested: Nov 02, 2006
Not Important/Relevant to my state(s)

Responder: Mark Mossler
State: VI
Date Requested: Nov 02, 2006
Not Important/Relevant to my state(s)

Responder: Holly Gatton
State: VA
Date Requested: Nov 03, 2006
Response: The 2006 Virginia Spray Guide for Commercial Small Fruit recommends the use of Malathion 8EC at a rate of 2 pt./A for control of blueberry tip borer and aphids. We conducted an email survey of blueberry growers, insect specialists, and Extension agents to obtain their feedback on the proposed label changes for malathion. Three of the growers that responded do not use malathion on their farms, although one indicated he would like to have it available should he wish to use it in the future. The agents that replied to our query believe that the new labeling restrictions are reasonable and will be accepted by growers in their areas.
Holly A. Gatton
Project Manager
Virginia Tech Pesticide Programs
Department of Entomology
34 Agnew Hall, MC 0409
Blackburg, VA 24061

Responder: Bill Cline
State: NC
Date Requested: Nov 03, 2006
Response: Does this discussion apply to all formulations and uses on blueberry, such as air-applied malathion ULV? See comments below. Also, please refer to the state crop profiles -- NC growers use an AVERAGE of 3.8 applications per year, MI growers 3.6 applications per year. The Pacific Northwest should not be used as a representative region. Growers in the PNW can get by with two malathion applications because they are outside the range of the blueberry maggot fly. For most of the blueberry acreage in the U.S. (MI, NC, NJ, ME), even three applications is not sufficient. Due to stringent regulations for importation of blueberries into Canada, I believe most growers in the U.S. are required to initiate scouting and/or calendar-based spray programs each year, within a certain number of days (5?) after receiving an annual blueberry maggot advisory for their state. Sprays must be applied every 7 to 10 days through harvest, usually 3 to 6 weeks on any given cultivar. Much of the acreage is sprayed by air with ULV malathion (10 oz/A, 96.5% a.i.). This is well below the per-application rate discussed in your e-mail below, but the frequency of application is greater (3 to 5 applications). Air applications are necessary at that time of year, because a tractor driving down the row would knock off too much fruit. Malathion at higher rates is also currently labeled for other key pests, such as cherry fruitworm, cranberry fruitworm, plum curculio, japanese beetle and sharpnosed leafhopper. Bill Cline Department of Plant Pathology North Carolina State University

Responder: Dan Horton
State: GA
Date Requested: Nov 03, 2006
Response: I responded to USDA requests for inputs on malathion in blueberries in late April 2006. Malathion is a very important material for Georgia blueberry growers. It works well, it doesn't trigger second pest outbreaks and it has a short PHI. The latter is very important, particularly for berries which are to be exported. Please see the attached response I made to USDA in April 2006. Dan Horton University of Georgia

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