Alfalfa
Relative Toxicities of Pesticides Used in Alfalfa to Natural Enemies and Honey Bees (7/01) ... [... more]
University of California IPM |
Western Yellowstriped Armyworm
This pest may be abundant in alfalfa fields in the Central Valley. The caterpillar is usually black, with two prominent stripes and many narrow bright ones on each side. At maturity it is approximately 1.5 to 2 ... [... more]
University of California IPM |
Blue Alfalfa Aphid And Pea Aphid
The most significant aphid predators are several species of lady beetles, including Hippodamia convergens and Coccinella septempunctata that attack and consume both of these aphid species; treatment thresholds for ... [... more]
University of California IPM |
Leafhoppers
Several species of Empoasca leafhoppers occur in alfalfa. They all have the same general overall appearance: small (0.125 inch long), bright green, wedge-shaped bodies. Nymphs (immatures) also have green wedge-shaped ... [... more]
University of California IPM |
Webworm
Webworms are dark green caterpillars with two white stripes and black spots on their backs. They are often found within webbed leaves. ... [... more]
University of California IPM |
Alfalfa Caterpillar
The yellowish orange or whitish alfalfa caterpillar butterflies lay eggs on the short alfalfa. These eggs hatch into green caterpillars in 3 to 10 days. Full grown caterpillars are about 1.5 inches long and are ... [... more]
University of California IPM |
Susceptibility Of Spring/Summer Weeds To Herbicide ...
3 Trifluralin is not usually applied at times suitable for controlling winter weeds. ... [... more]
University of California IPM |
Mormon Cricket
Adults are about 1 inch long, heavy-bodied, and tan colored. The wings are small and useless; these insects do not fly. The antennae are as long as the body, and the female has a sword-shaped ovipositor also as long ... [... more]
University of California IPM |
Special Weed Problems In Established Alfalfa
WEEDS POISONOUS TO LIVESTOCK. Several weed species found in California alfalfa fields are poisonous to livestock. The most dangerous are fiddleneck, yellow starthistle, and common groundsel. Many other weeds, and ... [... more]
University of California IPM |
General Information
If strip-cutting is impractical, retention of natural enemies may be promoted by leaving 10-foot, uncut strips of hay on alternate irrigation levees (borders). Uncut strips left at one harvest are cut at the ... [... more]
University of California IPM |
Cowpea Aphid
Cowpea aphid has been a long time resident of alfalfa in California as well as other states. Although frequently present in low numbers, it has rarely, if ever, reached population levels that cause damage. However, ... [... more]
University of California IPM |
Alfalfa Weed Photo Gallery, With Common And Scientific ...
W. M. Canevari, UC Cooperative Extension, San Joaquin Co. Acknowledgment for contributions to the weeds section: J. L. Schmierer, UC Cooperative Extension, Colusa Co. R. F. Norris, Vegetable Crops/Weed Science, UC Davis S. B. Orloff, UC ... [... more]
University of California IPM |
