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metribuzin (Lexone, Sencor) NYSDEC Approval of 2(ee) for Sencor DF 5/96

New York State Department of Environmental Conservation
Division of Solid & Hazardous Materials
Bureau of Pesticides & Radiation
Pesticide Product Registration Section
50 Wolf Road, Albany, New York 12233-7257
Phone 518 457-7446 FAX 518 485-8990
May 21, 1996
Mr. William G. Smith
Senior Extension Associate
Pesticide Management Education Program
Cornell Cooperative Extension
5123 Comstock Hall
Ithaca, New York 14853-0901
Dear Bill:
Re:  FIFRA 2(ee) Recommendation - Use of SENCOR DF Herbicide (EPA Reg No 
3125-325) on Carrots at Less Than Labeled Rate for Application at an 
Earlier Growth Stage
     The New York State Department of Environmental Conservation has 
approved your request for a FIFRA 2(ee) recommendation for use of SENCOR 
DF Herbicide (EPA Reg No 3125-325) on Carrots at Less Than Labeled Rate 
for Application at an Earlier Growth Stage.  Copies of the accepted 
recommendation are enclosed.
     Anyone using SENCOR DF under this recommendation must have the 
recommendation in their possession at the time of application.
     If you have any questions on this matter, please contact Frank 
Hegener of this office at (518) 457-7446.
Sincerely,
Maureen P. Serafini
Supervisor
Pesticide Product Registration Section
Enclosures
cc:  R. Mungari - NYS Dept. of Agriculture and Markets
Proposed FIFRA 2(ee) Recommendation
Researcher and Title:  Robin R. Bellinder, Associate Professor, 
Department of Fruit and Vegetable Science, Cornell University, Ithaca, 
NY 14853.
Pesticide Name and EPA Registration No.:
Metribuzin Sensor 75DF (3125-325)
Target Crop:  Carrots (Daucus carrota)
Proposed Application Rate: 0.125 lb ai/A to be applied broadcast: 
postemergence to carrots having at least 1 fully-developed true leaf. 
Subsequent applications of 0.25 lb ai/A may be applied after the 3-leaf 
stage.
Nature of 2(ee) variation from product label:  The chemical is currently 
labelled for application at 0.25 lb ai/A (113 lb product/A) but cannot 
be applied until the crop has 5 to 6 leaves.  This recommendation is for 
the use of lower rates at earlier timings.
Complete Recommendation: Sencor effectively controls many broadleaf 
weeds, including redroot pigweed, common lambsquarters, galinsoga, and 
some annual grasses.  Suppression of nutsedge and common ragweed have 
been observed.  For control of emerged broadleaf weeds early in the 
development of the carrot crop, apply 0.125 lb ai/A (1/6 lb product/A) 
to carrots having at least 1 fully-developed true leaf and 0 25 lb ai/A 
(1/3 lb product/A) to carrots having 3 or more leaves.  A single 
application applied prior to the 5-leaf stage of carrots will not 
provide adequate season-long control.  Multiple applications at 1- and 
3-, 2- and 4-, or 3- and 5-leaf stages will significantly improve weed 
control.  Crop injury shortly after application, has been seen in 
research trials however the effect has been transitory, with no yield 
losses attributable to crop injury.  Sencor is currently to be applied 
at 0.25 lb ai/A but not until carrots have at least 5 to 6 true leaves.  
However, failure to control weeds before this stage of development
will result in significant yield losses due to weed competition.
     The activity of metribuzin on both carrots and weeds is increased 
if applied after 3 or more cloudy days and when applied on very hot 
days.  Do not apply when the temperature exceeds 85 F.  Crop injury or 
delayed maturity may result from applications of Sencor if applied to 
carrots growing under stress conditions.
     Metribuzin often reacts with other herbicides or insecticides and 
damages carrots when the chemicals are tank-mixed or applied 
sequentially at close intervals.  Thus, several days, preferably 1 week, 
should elapse between metribuzin applications and applications of 
insecticides.
     Metribuzin is not to be applied with surfactants and no more than 
0.5 lb ai/A (2/3 lb product/A) may be applied in a growing season.  
Applications may be made up to 60 days before harvest.
Accepted for registration May 21, 1996.  New York State Department of 
Environmental Conservation, Division of Solid and Hazardous Materials, 
Pesticide Product Registration.