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How to Manage Pests
UC Pest Management Guidelines
Alfalfa
Webworm
Scientific Name: Loxostege spp.
(Reviewed 11/06,
updated 11/06)
In this Guideline:
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Webworms are dark green caterpillars with two white stripes and
black spots on their backs. They are often found within webbed leaves.
They vary in size up to almost 1.5 inches in length.
Webworms overwinter as larvae in the ground adjacent to their
fall food host. Moths emerge in early spring and lay eggs on leaves of host
plants. Larvae will feed for 3 to 5 weeks.
The larval stage feeds inside of webbed leaves on the upper parts of
the plant in summer and fall. If numbers are abundant, this webbing will be
clearly visible and will cover extensive areas of foliage.
Early cutting may give satisfactory control. Treatment is rarely
justified in California.
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UC IPM Pest Management Guidelines: Alfalfa
UC ANR Publication 3430
Insects and Mites
C. G. Summers, Entomology, Kearney Agricultural Center, Parlier
L. D. Godfrey, Entomology, UC Davis
M. Rethwisch, UC Cooperative Extension, Riverside County (Blythe)
D. R. Haviland, UC Cooperative Extension, Kern County
P. B. Goodell, Entomology, Kearney Agricultural Center, Parlier
R. F. Long, UC Cooperative Extension, Yolo County
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