University of Arizona a dot Cooperative Extension

Alfalfa Report
Yuma County, Arizona
July 15, 2002

Yuma County Office
2200 W. 28th Street, Ste. 102
Yuma, AZ 85364
(928) 726-3904
(928) 726-8472 FAX

Production Update:

Summer Cutting Schedule: Alfalfa is often cut before bloom to obtain the highest quality hay possible. Unfortunately, short cutting cycles can deplete alfalfa stands. This is especially true during the summer when nights are hot. Respiration at night consumes carbohydrates deposited in the root during the day and slows the buildup of carbohydrates needed to sustain the first two weeks of the next regrowth cycle. Therefore, delaying cutting until full bloom for at least one cutting during the summer can be beneficial for stand life.

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) (Detour sign picture); desert spider mite (T. desortorum Banks); strawberry mite (T. turkestani Ugarov & Nikolski) (Detour sign picture); and twospotted spider mite (Tetrancylus urticae Koch) (Detour sign 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.

Market Summary
Off grade
Past 2 Weeks (July 2 to July 15, 2002)
Last Year (July 2 to July 15, 2001)


10 Year Summary (July 2 to July 15, 1993-2002):

10 year summary of alfalfa (dollars per ton)

Full Disclaimers

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, Extension Agent, Yuma County
Michael Ottman, Agronomy Specialist
College of Agriculture, The University of Arizona.
Eric Natwick, UCCE Imperial County - Farm Advisor
University of California, Davis, CA.

Yuma County: Field Crops | Farm Notes | 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

document located at:
Copyright © 2001 University of Arizona,
College of Agriculture and Life Sciences
Webmaster: Al Fournier (