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oxydemeton-methyl (MSR Spray Concentrate)
NYS DEC Letter - Registration of Special Local Need 5/03

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

Bureau of Pesticides Management
Pesticide Product Registration Section
625 Broadway, Albany, New York 12233-7257
Phone 518-402-8768     FAX 518-402-9024
Website: http:// www.dec.state.ny.us/website/dshm
E-Mail: ppr@gw.dec.state.ny.us

May 13, 2003

CERTIFIED MAIL
RETURN RECEIPT REQUESTED


Ms. Rebecca A. Lamas
Registration Specialist
Gowan Company
P.O. Box 5569
Yuma, Arizona 85366-5569

Dear Ms. Lamas:

Re: Registration of Special Local Need Labeling for MSR Spray Concentrate (EPA Reg. No. 10163-220)

    The Department has reviewed your application, received April 2, 2003, to register Special Local Need (SLN) labeling for MSR Spray Concentrate (EPA Reg. No. 10163-220) in New York State.

    The SLN allows use on bulb onions for the control of thrips at the rate of 0.375 to 0.5 pounds of S-[2-(ethylsulfinyl)ethyl] 0,0-dimethyl phosphorothioate (or oxydemeton-methyl) per application with a maximum application rate of one pound of oxydemeton-methyl per acre per season.

    The Department has received numerous letters which expressed the need for the use of MSR Spray Concentrate on bulb onions for the control of thrips.

    Onion thrips damage plants by feeding on leaves, which indirectly reduces yields of onion bulbs. In New York State, up to 100% of onion fields may become infested with onion thrips and in severe situations yield loss may reach 50%. Thrips damage also may predispose onion plants to pathogens such as Alternaria porri, which causes purple leaf blotch disease. Onion thrips in New York State overwinter in and near onion fields and emerge in the spring. Usually, there are 3 to 5 overlapping generations per season. Insecticide use is the only effective tactic known to control this pest. Typically, a weekly foliar insecticide application regimen is initiated when onion thrips begin colonizing fields in June or July. Timing of the first application is recommended when the action threshold of 3 or more thrips per leaf is observed.

    Onion thrips infestations have been difficult to control due to insecticide resistance in all New York onion-growing areas. A Special Local Need registration for the use of MSR Spray Concentrate to control these resistant populations is needed.

    Therefore, under the authority of Section 24(c) of FIFRA, the Department hereby grants a Special Local Need registration for MSR Spray Concentrate (EPA Reg. No. 10163-220) for use on bulb onions for the control of thrips. The product is assigned the SLN registration number SLN No. NY-030002.

    The SLN allows use on bulb onions only. All precautionary statements, applicable use directions, use precautions and limitations of the labeling affixed to the MSR Spray Concentrate (EPA Reg. No. 10163-220) container must be followed.

    The product is classified as a federally "RESTRICTED USE PESTICIDE," and as noted on the "restriction" column on the certificate, is classified as "restricted use" in New York State. As such, this product is restricted in its purchase, distribution, sale, use, and possession in New York State.

    According to New York State Department of Environmental Conservation Regulations 6NYCRR 326.3(a): "It shall be unlawful for any person to distribute, sell, offer for sale, purchase for the purpose of resale, or possess for the purpose of resale, any restricted pesticide unless said person shall have applied for, and been issued a commercial permit."

    Should you require information to obtain a commercial permit, please contact the Pesticide Certification Section, at (518) 402-8748.

    The Certificate of Pesticide Registration and a copy of the New York State stamped "ACCEPTED" SLN labeling for MSR Spray Concentrate are enclosed for your records.

    Please be reminded that a copy of the accepted SLN label must be distributed with all product distributed in New York State and be in the possession of the user at the time of pesticide application.

    Please contact Ms. Jeanine Broughel, of my staff, at (518) 402-8768, if you have any questions.

Sincerely,

Samuel J. Jackling Chief
Pesticide Product Registration Section

Enclosures
cc: w/enc. - N. Kim/D. Luttinger - NYS Dept. of Health
R. Zimmerman/ R. Mungari - NYS Dept. of Ag. & Markets G. Good/W. Smith - Cornell University, PMEP