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How to Manage Pests
UC Pest Management Guidelines
Dry Beans
Alfalfa
Mosaic (Yellow Dot)
Pathogen: Alfalfa mosaic virus (AMV)
(Reviewed 8/07,
updated 8/07)
In this Guideline:
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Symptoms of alfalfa mosaic in beans vary depending on the strain of
the virus. Some strains cause only localized symptoms that may include necrotic
spots on infected leaves. Other strains infect the entire plant and cause
symptoms ranging from yellow dots to a striking yellow mottle, which may be
accompanied by leaf and pod distortion and stunted plant growth.
Alfalfa mosaic virus has a wide host range and is transmitted from
plant to plant by various aphids. Alfalfa is an important perennial host for
alfalfa mosaic.
Alfalfa mosaic is a minor disease of beans in California and
warrants no control measures. Growers should plant certified seed and may want
to avoid planting bean fields adjacent to alfalfa fields.
![[UC Peer Reviewed]](/IMAGES/logo-ucpeerreviewed.jpg)
UC IPM Pest Management Guidelines: Dry
Beans
UC ANR Publication 3446
Diseases
R. M. Davis, Plant Pathology, UC Davis
C. A. Frate, UC Cooperative Extension, Tulare County
Acknowledgment for contributions to Abiotic Disorders:
A. E. Hall, Botany and Plant Sciences, UC Riverside
Acknowledgment for contributions to Diseases/Abiotic Disorders:
S. R. Temple, Plant Sciences, UC Davis
Acknowledgment for contributions to Diseases (viruses):
R. L. Gilbertson, Plant Pathology, UC Davis
Acknowledgment for contributions to Diseases (Late-season decline):
J. Deelo, Plant Sciences, UC Davis
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