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):
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Barry Tickes, email@example.com Extension Agent, Yuma County
Michael Ottman, firstname.lastname@example.org Agronomy Specialist
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Eric Natwick, email@example.com UCCE Imperial County - Farm Advisor
University of California, Davis, CA.
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