Yuma County, Arizona
January 12, 2004
Yuma County Office
Insect Management: Egyptian alfalfa weevil (picture) populations buildup in hay fields during the early spring. Sample alfalfa fields every 2 to 4 days after weevil larvae first appear. Sample each field quadrant by taking 5 sweeps with a standard net. Count the number of weevil larvae (picture) in each 5 sweep sample and add the totals for each of the field quadrants. Divide the grand total for the field by the total number of sweeps (20). The field should be treated with an insecticide registered for weevil control when the average number of larvae reaches or exceeds 20 per sweep. If sweep counts are 10 to 15 larvae per sweep just before cutting, then applying malathion under the windrows may be considered. Avaunt is a newly registered insecticide for alfalfa hay production that will control EAW.
Weed Control: According to L1080 forms summarized by the Arizona
Dept. of Agriculture, the most commonly used herbicide in Arizona in 2002
was Trifluralin. 55,576 acres were treated with this herbicide which was
almost twice that of any other herbicide. Second was Kerb (29,734) followed
by Pendimetanlin (Prowl, Pendimax etc.)
10 Year Summary (Dec 30 - Jan 12, 1995-2004):
Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director Cooperative Extension, College of Agriculture and Life Sciences, The University of Arizona.
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Information provided by:
Barry Tickes, firstname.lastname@example.org Extension Agent, Yuma County
Michael Ottman, email@example.com Agronomy Specialist
College of Agriculture, The University of Arizona.
Eric Natwick, firstname.lastname@example.org UCCE Imperial County - Farm Advisor
University of California, Davis, CA.
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