Yuma County, Arizona
November 18, 2002
Yuma County Office
Insect Management: Cowpea aphid (picture) is the only black aphid found in alfalfa. Feeding causes stunting and produces honeydew, causing harvest problems and supports sooty mold growth reducing hay quality. There are no known alfalfa varieties that are resistant to cowpea aphid. However, genetic variation for resistance is known and resistant cultivars can be expected in the future. This pest is attacked by aphid parasites, Lysiphlebus sp. and several predators including lady beetles, lacewings, damsel bugs, bigeyed bugs, and syrphid flies. No economic treatment levels have been established for cowpea aphid in alfalfa. Treat with an aphicide if alfalfa is not growing properly and cowpea aphids are present.
Weed Control: Sencor controls a broad spectrum of broadleaf and grassy weeds but is difficult to use in the low deserts because of the rapid regrowth of our non-dormant varieties. Injury occurs if much foliage is present at the time of application. The best time to apply this herbicide is after sheeping when less foliage is present than there is following the cutting, curing and baling of hay.
10 Year Summary (Nov. 5 - Nov 18, 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, 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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