Yuma County, Arizona
January 14, 2002
Yuma County Office
Banking water: Many growers apply more water than alfalfa needs during the winter in order to have "water in the bank" during the summer. This practice does have some merit on deep soils if irrigation water is in short supply during the summer. Subsoil moisture can contribute to yield and stand survival when alfalfa is stressed for water. Alfalfa is a deep-rooted crop and can take up water from depths of 8 feet or more. Subsoil moisture at a depth of 20 to 30 feet has been reported to contribute to alfalfa survival in drought years under dryland conditions.
Insect Management: Growers occasionally ask about the cause of puckered green leaves in their alfalfa. Puckered, green leaves are symptoms of thirps feeding. Thrips are tiny insects 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: Sencor can be applied after sheeping and will control
many broadleaf and grassy weeds. Applications can be sprayed on when a
minimum of crop foliage is present or impregnated onto solid fertilizer.
If applying with fertilizer, a minimum of 200 lbs/acre should be used
to achieve adequate coverage.
10 Year Summary (Jan 1, - Jan 13, 1993-2002):
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, email@example.com Extension Agent, Yuma County
Michael Ottman, firstname.lastname@example.org Agronomy Specialist
College of Agriculture, The University of Arizona.
Eric Natwick, email@example.com UCCE Imperial County - Farm Advisor
University of California, Davis, CA.
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