Alfalfa Report Yuma County, Arizona March 8, 2004 Production Update: Insect Management: Egrets, Ibis, gulls and redwing black birds are commonly seen in alfalfa fields. Birds are important predators of various insect pests in alfalfa including the very damaging granulate cutworm (picture) . Egrets, Ibis, gulls are often seen at the leading edge of irrigation water eating crickets and worms forced to move or drown. These birds feed during the day and roost at night. Therefore, they only eat the cutworms in lands where water is run during daylight hours. Black birds eat cutworms, other worm pests and aphids on alfalfa stems. Total Digestible Nutrients (TDN): TDN is the sum of
digestible nutrients in the forage which includes crude protein, fat,
sugars, starch, and digestible fiber. TDN can be measured directly, but
is most often calculated from a mathematical formula using ADF (acid detergent
fiber) as the sole measured value. TDN and ADF are related to each other,
but this relationship varies by region and is subject to interpretation
by the individual nutritionist.
10 Year Summary (February 24, to March 8, 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. 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
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endorsement by The University of Arizona. Information provided by: Barry Tickes, btickes@ag.arizona.edu Extension Agent, Yuma County Michael Ottman, mottman@ag.arizona.edu Agronomy Specialist College of Agriculture, The University of Arizona. Eric Natwick, etnatwick@ucdavis.edu UCCE Imperial County - Farm Advisor University of California, Davis, CA. | ||||||||||||||||
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