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dimethenamid (Frontier)
NYS DEC Letter - Specific Exemption Request for Use 3/03

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

March 14, 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, VA 22202

Dear Mr. Rosenblatt:

Re: Specific Exemption Request for Use of dimethenamid (Frontier 6.0 EPA Reg. No. 7969-147) for Preemergence Control of yellow nutsedge and certain other broadleaf weeds in dry bulb onions grown on organic (muck) soils in New York State in 2003

    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 2002 Section 18 use.

    This is the fourth year that we are requesting dimethenamid (Frontier 6.0) for emergency use to control yellow nutsedge and other broadleaf weeds in the major muck soil onion production areas of New York State. Mechanical cultivation and hand weeding provide only limited control and require a preemergent herbicide for economic management of broadleaf weeds. Of the currently registered preemergent herbicides, dacthal is no longer in production, Buctril 2EC and Prowl 3.3 EC have no activity on yellow nutsedge, Glyphosate kills the companion crop and Dual cannot be applied early enough to control many weeds. The postemergent herbicides registered for use on dry bulb onions either have no activity on broadleaf weeds or cannot be used without resulting in unacceptable injury to onions.

    Research data from experiments conducted in New York onion fields over the last five years have shown that dimethenamid provides good to excellent control of yellow nutsedge and certain other broadleaf weeds, when it is applied at appropriate rates (Appendix 1).

    New York is requesting one application of dimethenamid (Frontier 6.0 EPA Reg. No. 7969-147) at a rate of 1.5 lb ai/A (32 oz/A) to be applied as a ground application by licensed applicators. Total acreage to be treated is 6,000 acres. The anticipated use season for dimethenamid in New York State is from May 1 to July 30, 2003.

    BASF Corporation, Agricultural Products Group, the manufacturer of Frontier 6.0, fully supports our efforts to obtain an emergency exemption for the use of dimethenamid (Frontier 6.0) on dry bulb onions in New York State for the 2003 growing season (Appendix 3). IR-4 fully supports this project and submitted the tolerance petition package to the EPA in 2000 (Appendix 4).

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


Maureen P. Serafini Director
Bureau of Pesticides Management
cc: w/enc. - A. Enache, EPA Region II
cc: w/o enc. - G. Good\W. Smith, Cornell University
R. Zimmerman\R. Mungari, New York State Dept. Of Ag & Mkts.