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How to Manage Pests
UC Pest Management Guidelines
Dry Beans
Monitoring During Vegetative Growth
(Reviewed 12/08,
updated 12/08)
In this Guideline:
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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.
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| 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
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| 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
![[UC Peer Reviewed]](/IMAGES/logo-ucpeerreviewed.jpg)
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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