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dicamba, diglycolamine salt (Clarity)
Active Ingredient Registration 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) 457-0300FAX: (518) 485-8836

June 9, 2000


Ms. Charlotte A. Sanson
Registration Scientist
BASF Corporation
PO Box 13528
Research Triangle Park, NC 27709-3528

Dear Ms. Sanson:

Re: Registration of Clarity Herbicide (EPA Reg. No. 7969-137) which Contains the New Active Ingredient Diglycolamine Salt of Dicamba

    The Department of Environmental Conservation (the Department) has reviewed your application, received June 4, 1999, and additional information, received November 10, 1999 and November 12, 1999, for the registration of Clarity Herbicide (EPA Reg. No. 7969-137) in New York State. The product contains the new active ingredient diglycolamine salt of dicamba. The application was deemed complete on January 11, 2000 and a registration decision is due by June 9, 2000.

    Clarity Herbicide is a water-soluble formulation intended for control and suppression of many annual, biennial, and perennial broadleaf weeds as well as woody brush and vines. Clarity may be used for control of weeds in asparagus, corn (field, pop, seed and silage), cotton, conservation reserve programs, fallow cropland, grass grown for seed, hay, proso millet, pasture, rangeland, general farmstead (noncropland), small grains, sorghum, soybean, sugarcane, and turf.

    The maximum application rate is 64 fluid ounces of product per acre per application and 64 fluid ounces of product per acre per season. This translates to 2 pounds of dicamba in the acid form (acid equivalent) per acre per application and per season. The following is a list of specific crops and application rates:

    pounds of acid equivalent dicamba per application
    pounds of acid equivalent dicamba per season
Asparagus 0.5 0.5
Barley - Fall 0.25 0.25
Barley - Spring 0.34 0.375
Corn 0.5 0.75
Fallow Ground 2.0 2.0
Grass grown for seed 2.0 2.0
Proso Millet 0.125 0.125
Pastureland/Conservation Reserve Program 2.0 2.0
Oats 0.125 0.125
Sorghum 0.25 0.5
Soybean 2.0 2.0
Turf 1.0 1.0
Wheat 0.25 0.5

    The application rates and crops on the Clarity Herbicide label are identical to other products currently registered in New York State which contain various salts of dicamba.

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

    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 at maximum application rates in vulnerable soils, such as Long Island, at 12 ppb, approximately six years after application. A similar pattern was found for the degradate, with potential contamination of 0.3 ppb. Considering the Department modeled maximum rates, with conservative modeling parameters, a 12 ppb level is well below the proposed drinking water standard of 50 ppb.

    Additionally, the Department conducts a groundwater monitoring program. Dicamba is routinely monitored throughout New York State by the United States Geological Survey (USGS) under contract to this Department. A review of our existing monitoring data reveals no significant levels of dicamba detected.

    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 (&g/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 &g/L.

    Neither Clarity Herbicide 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. No adverse impacts to fish or wildlife resources are expected through labeled use of this product.

    The labeled uses of Clarity Herbicide 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.

    Therefore, the Department hereby accepts for registration Clarity Herbicide (EPA Reg. No. 7969-137).

    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.


Maureen P. Serafini
Bureau of Pesticides Management


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 IIís - 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