Yuma County, Arizona
July 26, 2004
(PDF version, 106KB)
Insect Management: Several fields have developed injurious levels
of Empoasca (picture)
leafhopper this summer. Adult are about 1/8" long, bright green,
and have wedge-shaped bodies. Nymphs resemble adults but lack wings; both
run rapidly forward, backward, or from side to side when disturbed. At
the first sign of injury, Sample using a standard sweep net. Infestations
often start on field margins, so include them in your sampling. Taking
10 sweeps in 4 to 6 areas over the entire field and count the adults and
nymphs. When an alfalfa field is two or more weeks from harvest, treat
if counts reach 5 leafhoppers per sweep. If alfalfa is to be harvested
in 10 days to 2 weeks, treat if counts reach 10 per sweep. A leafhopper
infestation of treatable magnitude may be confined to the first 50 to
100 feet of the field margin. In this case, treat only the field edges.
Ambush®, Baythroid®, Furadan®, Guthion®, Lannate®,
Lorsban®, Mustang®, and Warrior® are insecticides that may
be used for leafhopper control in alfalfa.
10 Year Summary (July 13, to July 26, 1995-2004):
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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