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How to Manage Pests

UC Pest Management Guidelines


Lima bean seedlings with first trifoliate leaves.

Dry Beans

Monitoring During Vegetative Growth

(Reviewed 12/08, updated 12/08)

In this Guideline:


During the period of vegetative growth, walk the fields at least once weekly to observe overall stand quality. 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, or dying plants water-soaked lesions extending up stem; band of dead stem tissue Pythium spp.
yellowing plants; brick-red discoloration internally in roots and extending into above ground stems Fusarium wilt (blackeyes)
charcoal-like dust on stem surface charcoal rot
brick-red or brown external lesions on belowground stems and tap roots; small red flecks under lesion surface when scraped Fusarium root rot
yellowing leaves (may also be a result of saturated soils) leaves yellow or appear dry and curl slightly; honeydew or sooty mold present whiteflies
portions of leaves may yellow; leaves distorted thrips
sunken, red, oval spots at stem base and stem below soil; discrete, reddish brown lesions on upper tap roots of older plants Rhizoctoniaroot or stem rot
if the crop is blackeyes, has the field recently been irrigated N deficiency
wilting (starting in lower leaves); entire plant yellows; red-brown streaking inside stem (seen if cut open) Fusarium yellows or wilt (common beans)
mottled, distorted leaves light green-yellow and dark green mosaic pattern; puckering, blistering, distortion, downward curling, and rolling bean common mosaic virus
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 back 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 leafminers
curled leaves sticky, shiny leaves; black sooty mold aphids
downward cupping, puckering, wrinkling, and thickening of infected leaves; leaves brittle, dark green; plant with shortened internodes and stunted curly top
leaves with spots irregularly shaped spots bordered by lemon-yellow ring common bacterial blight
leaves with stippling very fine white or yellow stippling; fine webbing on leaf undersurface spider mites
white stippling on upper leaf surface; tiny, dark, varnishlike spots and small, white cast skins on lower leaves leafhoppers

IMPORTANT LINKS

PUBLICATION

[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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Statewide IPM Program, Agriculture and Natural Resources, University of California
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