Yuma County, Arizona
November 4, 2002
Yuma County Office
Insect Management: Thrips do not normally cause economically important damage to alfalfa. Several species of thrips may be found in alfalfa including: Western flower thrips (picture), Bean thrips (Caliothrips fasciatus), Onion thrips, Sixspotted thrips (picture) and Caliothrips phaseoli. Feeding injury is caused when thrips rasp the leaf surface with special mouthparts and then suck up the plant juices. Such feeding causes the surface of the leaf to be whitened or silvery and somewhat flecked or stippled in appearance. Feeding, particularly near the leaf mid-rib, causes curling and distortion of the leaves; they often have a cup-like or puckered appearance (picture). There is no evidence that thrips cause yield or quality loss in alfalfa. During the fall of 2001, Caliothrips phaseoli numbers were very high in seedling and mature stands. Some seedling stands required treatment due to the combined stress of herbicide treatments, hot weather and high thrips numbers.
Weed Control: Kerb often misses weeds in alfalfa that it normally controls in other crops. This is because Kerb leaches below the germinating weed seeds when flood irrigations of 5 to 6 inches are applied. Only the most sensitive grasses are usually controlled.
10 Year Summary (Oct. 22 - Nov. 4, 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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