How to Manage Pests
UC Pest Management Guidelines
In this Guideline:
Well-chosen fields can result in fewer pests and better
yields, so, consider the information below when evaluating a field for dry bean
PREVIOUS CROPPING HISTORY
Have pests of bean such as lygus bugs, mites, leafminers,
seedling diseases, charcoal rot, white mold, nematodes, or problematic weeds
been present in the field in recent years?
Do these areas harbor any of the pests above? Are alfalfa,
cotton, or safflower, which all harbor lygus bugs, growing nearby? Alfalfa can
also be a source of armyworms, cutworms, darkling beetles, and cowpea aphids.
Check which bean varieties have been planted in previous
years, their planting and harvest dates, and yields. Determine if the field has
supported successful bean production in the past.
ASSAY SOIL AND WATER
- Check for excessive salt and boron, and other mineral
imbalances. Ask your local farm advisor about acceptable soil boron levels for
your bean type.
If there is a potential for herbicide residual from the
previous crop, perform a soil herbicide bioassay. Residues may inhibit seedling
Identify soil type. Beans can grow in a variety of soil
types, ranging from coarse sands to clay loams, provided that irrigation is
managed to prevent water stress and water logging. If possible, choose a field
with deep, uniform loamy soil. Avoid fields with major variations in soil type because it makes
application of herbicides difficult as rates must be adjusted for soil type.
Check irrigation water. If the quality of the
irrigation water is unknown, assay for pH, salinity, and specific ion
Sample for root knot nematodes. Before planting beans, assay for
nematodes if they have been a problem in a previous crop.
Although continuous cropping is not recommended, if one bean
crop must follow another, treat any weed infestations before planting (see
SPECIAL WEED PROBLEMS), and use treated seed if the field has soil pathogens.
If a field is infested with a soil pathogen or weed, consider crop rotation.
Fields to avoid, when possible, are those severely infested with:
UC IPM Pest Management Guidelines: Dry Beans
UC ANR Publication 3446
W. M. Canevari, UC Cooperative Extension, San Joaquin County
C. A. Frate, UC Cooperative Extension, Tulare County
L. D. Godfrey, Entomology, UC Davis
P. B. Goodell, UC IPM Program, Kearney Agricultural Research Center, Parlier
R. F. Long, UC Cooperative Extension, Yolo County
C. J. Mickler, UC Cooperative Extension, Stanislaus County
S. C. Mueller, UC Cooperative Extension, Fresno County
J. L. Schmierer, UC Cooperative Extension Colusa County
S. R. Temple, Plant Sciences,UC Davis
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