Yuma County, Arizona
November 18, 2002
Yuma County Office
Insect Management: Cowpea aphid (picture) is the only black aphid found in alfalfa. Feeding causes stunting and produces honeydew, causing harvest problems and supports sooty mold growth reducing hay quality. There are no known alfalfa varieties that are resistant to cowpea aphid. However, genetic variation for resistance is known and resistant cultivars can be expected in the future. This pest is attacked by aphid parasites, Lysiphlebus sp. and several predators including lady beetles, lacewings, damsel bugs, bigeyed bugs, and syrphid flies. No economic treatment levels have been established for cowpea aphid in alfalfa. Treat with an aphicide if alfalfa is not growing properly and cowpea aphids are present.
Weed Control: Sencor controls a broad spectrum of broadleaf and grassy weeds but is difficult to use in the low deserts because of the rapid regrowth of our non-dormant varieties. Injury occurs if much foliage is present at the time of application. The best time to apply this herbicide is after sheeping when less foliage is present than there is following the cutting, curing and baling of hay.
10 Year Summary (Nov. 5 - Nov 18, 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.
The University of Arizona is an equal opportunity, affirmative action institution. The University does not discriminate on the basis of race, color, religion, sex, national origin, age, disability, veteran status, or sexual orientation in its programs and activities.
Any products, services, or organizations that are
mentioned, shown, or indirectly implied in this web document do not imply
endorsement by The University of Arizona.
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.
Field Crops | Farm
Alfalfa Reports | Vegetables
Forages: Crop Mgmt | Soil Mgmt | Irrigation | Alfalfa Reports | Insects | Diseases | Weeds | Pesticides
Home | Other Crops | Forages
For more Arizona Production Ag Information:
Home | Cotton | Veggies| Forages | Grains | Citrus | Crop x Crop | Insects | Diseases| Weeds | Pesticides | News | Weather | Research | Photos | Contacts | General Info. | Site Map
located at: http://cals.arizona.edu/crops/counties/yuma/alfalfareports/afalfarpt111802.html
Copyright © 2001 University of Arizona,
College of Agriculture and Life Sciences
Webmaster: Al Fournier (firstname.lastname@example.org)