Yuma County, Arizona
December 1, 2003
Yuma County Office
Insect Management: Spotted alfalfa aphid (SAA) (picture) caused severe damage to alfalfa in Arizona and California in the 1950s. Control was achieved through a combination of introduced parasites and host plant resistance. SAA still occasionally causes problems, but generally only when susceptible cultivars are grown. Since 1996, SAA has occasionally appeared in damaging numbers in highly resistant alfalfa varieties. A number of seedling alfalfa fields needed to be treated for SAA during the fall of 2002. The reasons for the appearance of this aphid in highly resistant cultivars is being investigated. There is every reason to believe that the highly resistant cultivars will continue to keep the SAA in check along with the indigenous and introduced natural enemies. SAA develops better under warm temperatures than pea aphid or blue alfalfa aphid.
Weed Control: Common groundsel (picture)
is a weed in the composite family that has appeared in La Paz County and
is becoming increasingly widespread. It has not been reported in Yuma
County. It is a difficult-to-control weed that can be poisonous to cattle
10 Year Summary (Nov 18 - Dec 1, 1994-2003):
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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