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

Production Update:
Alfalfa Fiber: High fiber content in alfalfa is generally not desirable for feeding lactating dairy animals. However, a fiber content that is too low is theoretically possible. Alfalfa is valuable as an ingredient in diary rations because it does contain some fiber. The fiber in alfalfa slows the passage rate through the animal allowing more nutrients in the feed mixture to be digested and utilized.

Insect Management: Growers occasionally ask about the cause of puckered green leaves in their alfalfa (picture). Puckered, green leaves are symptoms of thrips feeding. Thrips are tiny insects (picture) that feed on the surface of young leaves and bud tissue. The injury to the leaves is minor and quickly scars over. The scarred tissue does not grow as quickly as undamaged leaf tissue causing the leaves to pucker and curl. Thrips may be an important alternative food source for predaceous insects that help control more serious alfalfa insect pests. Presently there is no information on the economic importance of thrips in alfalfa and no control actions are recommended.

Weed Control: The most economical treatments for summer annual weeds are preemergence herbicides. These should be applied well ahead of possible germination times. Mid to late February is best. Weeds that have already germinated will not be controlled. What you see is what you don't get with preemergent herbicide.

10 Year Summary (Jan 27, to Feb 9, 1995-2004):

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