Yuma County, Arizona
September 9, 2002
Yuma County Office
Insect Management: The granulate cutworm, Agrotis subterranea (Fabricius) (picture) can be a devastating pest of alfalfa. They often go undetected until after cutting and hay removal. When fields are watered back, there may be areas with little 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, hold back regrowth, depleting starch reserves in the crowns and thereby weaken the plants. Weakened plants are more susceptible to disease. Permethrin, cyfluthrin and endosulfan are insecticides that control this pest, but larvae feeding under duff may escape insecticide treatments.
Weed Control: October is a good time to apply preemergent herbicides for winter annual grass control. Annual bluegrass in particular will germinate early in the season and is difficult to see and often missed by late applications. Other winter grasses like canarygrass or wildoat, require cooler soil temperatures to germinate. Remember that it is better to be a month early than a day late with preemergence treatments.
10 Year Summary (Aug. 27 - Sept. 9, 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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