Yuma County, Arizona
July 28, 2003
Yuma County Office
Insect Management: Webworms (picture) (alfalfa webworm, beet webworm and garden webworm) are occasional pests of desert alfalfa. The small webworm moths lay scale-like eggs on the undersides of alfalfa leaves. Larvae may grow to an inch in length, are yellowish green, with stripes or spots, depending on the species. Webworm larvae devour leaves beneath silken webs on the upper parts of alfalfa plants during the summer and fall. They do not usually cause serious economic damage. Harvesting usually greatly reduces the population levels infesting the alfalfa during the next crop cycle.
Weed Control: When alfalfa is taken out to establish a different
crop, herbicides used during the previous year or two can cause problems
to some crops. The herbicides used in alfalfa that have the longest persistence
in the soil are Pursuit and Zorial. Those with moderate soil persistence
are Sencor, Raptor, Balan, Eptam, Trifluralin and Kerb. Those with slight
persistence are Gramoxone, Buctril and 2,4-DB. Poast and Select are not
likely to cause problems.
10 Year Summary (July 15 - July 28, 1994-2003):
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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