Yuma County, Arizona
February 9, 2004
Yuma County Office
Insect Management: Growers occasionally ask about the cause of puckered green leaves in their alfalfa (picture). Puckered, green leaves are symptoms of thrips feeding. Thrips are tiny insects (picture) that feed on the surface of young leaves and bud tissue. The injury to the leaves is minor and quickly scars over. The scarred tissue does not grow as quickly as undamaged leaf tissue causing the leaves to pucker and curl. Thrips may be an important alternative food source for predaceous insects that help control more serious alfalfa insect pests. Presently there is no information on the economic importance of thrips in alfalfa and no control actions are recommended.
Weed Control: The most economical treatments for summer annual weeds are preemergence herbicides. These should be applied well ahead of possible germination times. Mid to late February is best. Weeds that have already germinated will not be controlled. What you see is what you don't get with preemergent herbicide.
10 Year Summary (Jan 27, to Feb 9, 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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