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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:
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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 |
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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