How to Manage Pests

UC Pest Management Guidelines

Dry Beans

Monitoring During Flower Bud Through Bloom

(Reviewed 12/08, updated 12/08)

In this Guideline:

During the period of flower bud through bloom, start sweep sampling for lygus bugs twice weekly. Use the table below and the photo identification page to help identify pests and pest damage.

What the problem looks like: Check for: Possible cause(s):
collapsed, wilting, stunted, or dying plants charcoal-like dust on stem surface charcoal rot
water-soaked lesions on stem Pythium spp.
yellowing leaves; center of the root and stem have brown discoloration (seen when cut open) Fusarium wilt (blackeyes)
brick-red lesions on below ground stems, tap roots that eventually turn brown Fusarium root rot
root galling; brown-black root lesions nematodes
yellowing leaves (may also be a result of saturated soils) leaves yellow or dry and slightly curled; honey-dew or sooty mold sometimes present whitefly
striking yellow mottle alfalfa mosaic
if the crop is blackeyes, has the field recently been irrigated N deficiency
mottled, distorted leaves striking yellow mottle alfalfa mosaic
green-yellow and dark green mosaic pattern on leaves; discoloration usually accompanied by puckering, blistering, downward curling bean common mosaic
bright, yellow to green mosaic or mottling; leaves distorted, cupped downward, and wrinkled bean yellow mosaic
damaged flower buds and blossoms missing blossoms and plant bugs lygus bugs, stink bugs
leaves with holes; skeletonized leaves presence of mottled, olive-green to almost black caterpillars; or, black caterpillars with prominent yellowish stripe and several bright stripes on each side armyworms
presence of green caterpillars that arch backs when crawling loopers
presence of hairy caterpillars saltmarsh caterpillar
green beetle with black spots cucumber beetle
leaves with mines slender, winding trails or large, whitish blotches leafminer
curled leaves sticky, shiny leaves; black sooty mold; presence of aphids aphids
leaves with spots irregularly shaped spots bordered by a lemon-yellow ring; dead brown tissue in center of larger spots common bacterial blight
necrotic spots on infected leaves; yellow dots alfalfa mosaic
leaves with stippling very fine white or yellow stippling; fine webbing on leaf undersurface spider mite
white stippling on upper surface of leaf; tiny, dark, varnishlike spots and small, white cast skins on lower surface of leaf leafhopper



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Dry Beans
UC ANR Publication 3446

General Information

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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