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Dicamba, Sodium Salt - Registration of Northstar CustomPak 6/00

New York State Department of Environmental Conservation
Division of Solid & Hazardous Materials
Bureau of Pesticides Management, Room 498
Pesticide Product Registration Section

50 Wolf Road, Albany, New York 12233-7254
Phone: (518) 457-0300 FAX: (518) 485-8836
Website: www.dec.state.ny.us/website/dshm/pesticid/pesticid.htm


June 9, 2000

herbicide
CERTIFIED MAIL
RETURN RECEIPT REQUESTED

Mr. Jerry Harrison
Manager, State Registration and Regulatory Support
Novartis Crop Protection, Inc.
PO Box 18300
Greensboro, NC 27419-8300

Dear Mr. Harrison:

Re: Registration of NorthStar CustomPak (EPA Reg. No. 100-923) which Contains the New Active Ingredient Sodium Salt of Dicamba

    The Department of Environmental Conservation (the Department) has reviewed your application, received on June 9, 1999, and additional information, received on September 23, 1999, November 10, 1999 and November 12, 1999, for the registration of NorthStar CustomPak (EPA Reg. No. 100-923) in New York State. The product contains the new active ingredient sodium salt of dicamba and the currently registered active ingredient primisulfuron-methyl. Primisulfuron-methyl is the active ingredient in Beacon Herbicide. The application was deemed complete on January 11, 2000, and a registration decision is due by June 9, 2000.

    NorthStar CustomPak is a selective herbicide applied after emergence of both crop and weeds for the control of many broadleaf weeds, shattercane, sorghum-almum, johnsongrass, and quackgrass in field corn (grown for grain, silage, or seed) and popcorn.

    The maximum application rate is 5 ounces of product per acre per application and only one application is permitted per season. This translates to 0.137 pounds sodium salt of dicamba (0.125 pounds acid equivalent) per acre per application and 0.023 pounds primisulfuron-methyl per acre per application.

    Primisulfuron-methyl was reviewed in-depth and first registered for use in New York State in 1997. Products containing primisulfuron-methyl are not allowed to be aerially applied in New York State. The NorthStar CustomPak label contains directions for ground application only.

    The Department has reviewed the information supplied to date in support of the pesticide product registration application for NorthStar CustomPak.

    In the absence of groundwater monitoring data, the Department performs computer modeling using conservative parameter values at maximum application rates. The computer modeling indicated potential leaching of parent dicamba in vulnerable soils, such as Long Island, at 0.7 ppb. A similar pattern was found for the degradate, with potential contamination of 0.018 ppb. The 0.7 ppb level is well below the proposed drinking water standard for dicamba of 50 ppb. Therefore, when NorthStar CustomPak is applied at the labeled rates, little impact to ground and surface water is expected.

    There are no chemical specific federal or State drinking water/groundwater standards for dicamba or its degradates. Based on their chemical structures, these compounds fall under the 50 microgram per liter (mg/L) general New York State drinking water standard for 'unspecified organic contaminants' (10 NYCRR Part 5, Public Water Systems). The New York State drinking water standard for the sum of 'unspecified organic contaminants' and 'principal organic contaminants' is 100 mg/L.

    Neither NorthStar CustomPak nor dicamba were very toxic following acute exposures in laboratory animal studies. Dicamba was not very toxic following chronic exposure and was not carcinogenic in mice or rats. While dicamba caused developmental toxicity in rabbits but not rats, these effects only occurred at doses that also caused maternal toxicity. Dietary exposure to dicamba from all food commodities for which there are tolerances is estimated to be below the reference dose.

    Dicamba is practically non-toxic to mammals. It is slightly toxic to the Mallard duck and is moderately toxic to the Bobwhite Quail. Parent dicamba is practically non-toxic to freshwater and marine fish and invertebrates.

    Worst-case runoff modeling of the dicamba content of the NorthStar CustomPak product results in surface water concentrations an order of magnitude below levels of concern for the most sensitive aquatic species. No adverse impacts to fish or wildlife resources are expected through labeled use of this product.

    The labeled uses of NorthStar CustomPak do not appear to pose a significant risk to workers or the general public. No adverse effects to groundwater/surface water, fish or wildlife are anticipated through normal use of the product when applied via ground application equipment.

    Therefore, the Department hereby accepts for registration NorthStar CustomPak (EPA Reg. No. 100-923). The product is approved as labeled for ground application only.

    Enclosed are your New York State stamped "ACCEPTED" label and a copy of the Certificate of Registration.

    If you have any questions, please contact Francis X. Hegener, Acting Chief of our Pesticide Product Registration Section, at (518) 457-7446.

Sincerely,

Maureen P. Serafini
Director
Bureau of Pesticides Management

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
bcc: w/enc. - T. Sinnott
SPCS I, Reg. 1
PCS II's - Regions 2-7 & 9
D. Rollins, Reg. 8
J. Broughel (2)
Product File
Chemical File
Active File

bcc: w/o enc. - J. Leach
T. Lynch
M. Serafini
F. Hegener
L. Whitbeck
Daybook

JMB:jmb
(NORSTAR.REG)