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Dry
Beans > Year-Round IPM Program > Vegetative
Growth > Damage
to Young Plants
Dry Beans
Pests and their Damage to Young Plants—Vegetative Growth
On this page
- Charcoal rot
- Pythium spp.
- Fusarium root rot
- Fusaruim wilt
- Thrips
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- Rhizoctonia spp.
- Fusarium yellows or wilt
- Bean common mosaic virus
- Leafminer
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- Armyworm
- Loopers
- Saltmarsh caterpillar
- Cucumber beetle
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- Aphids (cowpea, bean)
- Curly top
- Spider mite
- Leafhopper
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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 damage
Identification
tip: Charcoal-like dust on stem surface.
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Pythium spp. (blackeyes) damage
Identification tip: Blackeye bean stem tissue
dries out, becomes sunken, and turns tan to brown in color
when infected.
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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.
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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).
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| Yellowing
leaves |
Thrips
Identification tip: Upward cupping and distortion
of blackeye bean leaves, caused by thrips.
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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 sp. damage
Identification tip: If yellowish leaves are found,
look for a reddish external color on roots, characteristic
of a Fusarium sp. infection.
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| Mottled
or distorted leaves |
Leaves
with mines |
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.
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Leafminer damage
Identification tip: Wavy tan leaf mines in surface
of bean leaves.
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Curled
leaves |
Aphid damage
Identification
tip: Curled, sticky, and shiny leaves
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Curly top damage
Identification
tip: Down-cupping, puckering, and wrinkling of infected leaves;
leaves become thick, brittle; plant stunted.
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Cowpea aphid adults
Identification
tip: Shiny black. Legs and antennae white to pale-yellow
with black tips.
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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.
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| Leaves
with stippling |
Spider mite damage
Identification
tip: Very fine white or yellow stippling; fine webbing
on leaf undersurface.
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Leafhopper damage
Identification
tip: White stippling on upper surface of leaves; small
white cast skins, tiny dark varnishlike spots on undersurface
of lower leaves.
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