Yuma County, Arizona
November 17, 2003
Yuma County Office
Insect Management: The granulate cutworm, Agrotis subterranea (Fabricius), is a devastating pest of bed planted alfalfa and is also an occasional pest of flood irrigated alfalfa. The cutworm larvae (picture) often go undetected until after cutting or hay removal. When fields are watered back, there may be areas of little or no regrowth due to cutworms feeding on new shoots from alfalfa crowns. Granulate cutworm is nocturnal and will move from cracks in the soil or from under duff in the evening and climb into the alfalfa canopy to feed. Some of the cutworms feed on new shoots under the duff, holding back regrowth, depleting starch reserves in the crowns and thereby weaken the plants. Weakened plants are more susceptible to disease. Permethrin, cyfluthrin and Steward are insecticides that control this pest. Cutworms feeding under the duff may escape insecticide treatments.
Weed Control: Our chemical weed control chart is enclosed (PDF
file, 82KB). The chart that was included in the latest "Farm
Notes" and some earlier publications had the wrong ratings for Balan.
The correct ratings are: Summer annual grasses-good control, winter annual
grasses-good control, sandbur-good control, shepardspurse-no control,
London rocket-no control, lambsquarter-partial control, goosefoot-partial
control, malva-no control, pigweed-partial control, bermudagrass-no control,
and nutsedge-no control.
10 Year Summary (Nov 4 - Nov 17, 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, 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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