Yuma County, Arizona
July 15, 2002
Yuma County Office
Insect Management: Spider mites in alfalfa may be associated with water stress and infestations may clear up a few days after an irrigation. Infestations start in the lower plant canopy moving upward and leaves are covered with webbing. Spider mites insert needle-like mouth parts into leaves removing plant sap, causing a yellow stippling on leaves. With severe feeding leaves turn brown, become dry and drop from the plant. Feeding damage reduces yield, quality and retards regrowth. Spider mite species in Western Arizona & Southern California include: carmine spider mite (T. cinnabarinus Boisdival) ( picture); desert spider mite (T. desortorum Banks); strawberry mite (T. turkestani Ugarov & Nikolski) ( picture); and twospotted spider mite (Tetrancylus urticae Koch) ( adult picture, feeding damage). Pyrethroid insecticides can flare spider mite infestations. Sulfur may be used to suppress the populations.
Weed Control: Anyone who has worked with the dinitroaniline herbicides such as pendimethelin (prowl), trifluralin (treflan) or benefin (balan) knows that these yellow herbicides are easy to get on yourself and equipment and hard to clean off. WD-40 works well to clean it off. If you spray it on, the yellow wipes right off. WD-40 contains petroleum distillates and is harmful if ingested, inhaled or if it comes in contact with your eyes or skin. Read and follow the directions on the label.
10 Year Summary (July 2 to July 15, 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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