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fenbuconazole (Indar)
NYS DEC Letter - Specific Exemption Request for Use on Blueberries 12/03

New York State Department of Environmental Conservation
Division of Solid and Hazardous Materials

Bureau of Pesticides Management, 9th Floor
625 Broadway, Albany, New York 12233-7254
Phone: (518) 402-8788     FAX: (518) 402-9024
Website: www.dec.state.ny.us

December 10, 2003

Mr. Dan Rosenblatt
Acting Team Leader
USEPA / Office of Pesticide Programs
Emergency Response Team (7505C)
Document Processing Desk
Crystal Mall 2-- 2nd Floor
1921 Jefferson Davis Hwy.
Arlington, Virginia 22202

Dear Mr. Rosenblatt:

Re: Specific Exemption Request for Use of Fenbuconazole (Indar 75 WSP, EPA Reg. No. 707-239) to Control Mummyberry of Blueberry Crops in 2004

    The New York State Department of Environmental Conservation, as the State lead agency for pesticide matters, hereby requests approval of the referenced application (see enclosure) under Section 18 of the Federal Insecticide, Fungicide and Rodenticide Act, as amended. The enclosed application includes the information required in 40 CFR, Part 166, Subpart B (166.20). Also enclosed, is the use report from the 2003 Section 18 use (Appendix 5).

    This is the second year that we are requesting fenbuconazole (Indar 75 WSP) for emergency use to control mummyberry on blueberries. Mummyberry is the most common fungal disease of blueberries in North America. Large crop losses can occur when weather is wet in the spring and control measures are not undertaken. Mummyberry has two distinct phases, shoot blight and fruit infection. Yield losses of ten percent from mummyberry are common if even a single fungicide application is missed or improperly timed. Losses of 25-56% are possible when no controls are applied.

    Funginex (triforine) has been widely relied on in blueberry production in New York and nationwide for management of mummyberry disease. The cancellation of triforine has created a serious void since none of the currently labeled fungicides for blueberries are as effective against mummyberry as Funginex. Abound 2.08F (azoxystrobin) has been shown to have moderate activity when disease pressure is low, but is ineffective when disease pressure is high. Bravo (clorothalonil) does target both primary and secondary infection, but has poor efficacy against mummyberry.

    Field trials with Indar have been conducted in New Jersey, Michigan, and Georgia, and highbush blueberry trials have been conducted in other states. The results demonstrate a high level of efficacy (see section #5 and Appendix 2). A time-limited tolerance was established in 1998 and extended until December 31, 2004, for fenbuconazole on blueberries at 1.0 ppm (see Appendix 3).

    A maximum of five foliar applications, using ground equipment, of Indar 75 WSP per season is requested. The first application is to be made beginning at green tip and continued on seven- to ten-day intervals through petal fall. The recommended rate is 2.0 oz of Indar 75 WSP/acre/application (1.5 oz. ai/acre/application). It is estimated that all of the 700 acres of blueberry in bearing age may be treated. Nearly all of this acreage is contained within the following counties: Niagara, Ontario, Monroe, Wayne, Oswego, Cayuga, Seneca, Schuyler, Tompkins, Steuben, Chemung, Tioga, Schenectady, Albany, Saratoga, Dutchess, Columbia, and Ulster counties. Therefore, the maximum anticipated (worst case scenario) use of Indar 75 WSP is 437.51b of product or 328.125 lb of active ingredient.

    Dow Agrosciences, LLC, the manufacturer of Indar 75 WSP Fungicide, fully supports our efforts to obtain an emergency exemption for the use of Indar 75 on blueberries in New York State (see Appendix 4). The company, in conjunction with the IR-4 Project, continues to make progress toward new registrations with petitions pending at USEPA for the use of fenbuconazole on blueberries.

    The anticipated use season for thiophanate-methyl on blueberries in New York State is from March 1-June 30, 2004. The suggested use pattern will restrict applications after petal fall. Therefore, a PHI of 30 days is requested. All applicable restrictions currently on the label would apply (see Appendix 1 for proposed label language).

    Please contact Robin Hackett, of our Pesticide Product Registration Section, at (518) 402-8768, if you require further assistance on this request.

Sincerely,

Maureen P. Serafini
Director
Bureau of Pesticides Management

Enclosures
cc: w/enc. - A. Enache, USEPA Region II
cc: w/o enc. - G. Good\W. Smith, Cornell University, PMEP
R. Zimmerman\R. Mungari, New York State Dept. Of Ag. & Mkts.