Dry Beans

Pests and their Damage to Young Plants—Vegetative Growth

On this page
  • Charcoal rot
  • Pythium spp.
  • Fusarium root rot
  • Fusaruim wilt
  • Thrips
  • Rhizoctonia spp.
  • Fusarium yellows or wilt
  • Bean common mosaic virus
  • Leafminer
  • Armyworm
  • Loopers
  • Saltmarsh caterpillar
  • Cucumber beetle
  • Aphids (cowpea, bean)
  • Curly top
  • Spider mite
  • Leafhopper

Collapsed, wilted, dying
Yellowing of leaves
Mottled or distorted leaves
Leaves with holes

Leaves with mines
Curled leaves
Leaves with spots
Leaves with stippling

Use the photos below to identify damage to young plants. Names link to more on identification and management.

Click on photos to enlarge
Collapsed, wilting, stunted, or dying plants

Charcoal rot
Charcoal rot damage
Identification tip: Charcoal-like dust on stem surface.

Pythium spp.
Pythium spp. (blackeyes) damage
Identification tip: Blackeye bean stem tissue dries out, becomes sunken, and turns tan to brown in color when infected.

Fusarium root rot
Fusarium root rot damage
Identification tip: Brick-red lesions of variable size on belowground stems, tap roots; red lesions turn brown; small red flecks under scraped lesion surface.

Fusarium wilt
Fusarium wilt (of blackeyes) damage
Identification tip: Pale green, flaccid leaves turn yellow and drop off; brown discoloration in center of root, stem, and some branches (seen when sliced).

Yellowing leaves

Thrips damge
Identification tip: Upward cupping and distortion of blackeye bean leaves, caused by thrips.

Rhizoctonia root or stem rot
Rhizoctonia solani damage
Identification tip: Sunken, red, oval, spots at stem base and stem parts below soil; discrete reddish brown lesions on upper tap roots of older plants.

Fusarium yellows or wilt
Fusarium sp. damage
Identification tip: If yellowish leaves are found, look for a reddish external color on roots, characteristic of a Fusarium sp. infection.

Mottled or distorted leaves Leaves with mines

Bean common mosaic virus
Bean common mosaic virus
Identification tip: Green-yellow and dark green mosaic pattern on leaves; discoloration usually accompanied by puckering, blistering, distortion, and downward curling.

Leafminer damage
Leafminer damage
Identification tip: Wavy tan leaf mines in surface of bean leaves.

Leaves with holes; skeletonized leaves

Armyworm damage
Armyworm young larva and damage
Identification tip: Newly hatched larva scrapes leaf tissue, "skeletonizing" leaf.

Armyworm damage
Armyworm older larva and damage
Identification tip: Older larva chews large sections of leaves.

Looper damage on dry bean
Loopers damage
Identification tip: Chews holes in mature leaves.

Saltmarsh caterpillar
Saltmarsh caterpillar young larvae and damage
Identification tip: Young larvae feed in groups, chewing holes in leaves. Older larvae (not pictured here) feed individually.

Cucumber beetle
Cucumber beetle adult and damage
Identification tip: Chews holes in leaves.

Curled leaves

Aphid damage
Aphid damage
Identification tip: Curled, sticky, and shiny leaves

Curly top
Curly top damage
Identification tip: Down-cupping, puckering, and wrinkling of infected leaves; leaves become thick, brittle; plant stunted.

Cowpea aphid
Cowpea aphid adults
Identification tip: Shiny black. Legs and antennae white to pale-yellow with black tips.

Bean aphid damage
Bean aphid adults
Identification tip: Slightly larger than the cowpea aphid; dark olive green to black with light-colored legs. Also may cause leaves with spots.

Leaves with stippling

Spider mite damage
Spider mite damage
Identification tip: Very fine white or yellow stippling; fine webbing on leaf undersurface.

Leafhopper damage
Leafhopper damage
Identification tip: White stippling on upper surface of leaves; small white cast skins, tiny dark varnishlike spots on undersurface of lower leaves.

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2018 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   Contact webmaster.