Agriculture: Dry Beans Pest Management Guidelines

Monitoring During Stand Establishment

As soon as the crop emerges, observe the stand for overall quality. Use the table below and the photo identification page to help identify pests and pest damage.

What problem looks like: Check for: Possible cause(s):
Blank spots Seeds present, but failed to emerge:
Rotting seeds Seedling diseases
Seeds planted too shallow or deep Planting method
Tiny, slender, white centipede-like pests with 11 to 12 pairs of legs and prominent antennae Symphylans
Maggot(s) feeding on seeds Seedcorn maggot
Shiny, slender, cylindrical, hard-bodied, yellow to brown larvae in soil Wireworms
Birds foraging in field Birds
Seeds or seedlings dead or missing:
Tiny, slender, white centipede-like pests with 11 to 12 pairs of legs and prominent antennae in soil Symphylans
Shiny, slender, cylindrical, hard-bodied, yellow-to-brown larvae in soil Wireworms
Presence of mounds Gopher
Maggots in soil Seedcorn maggot
Dead seedlings Seedling diseases
Birds foraging in field Birds
Slow emergence; poor stand establishment Maggots feeding on seedling roots Seedcorn maggot
Recent herbicide applications, drift Possible herbicide injury
Seed planted too deep Planting technique
Dry soil Not enough moisture
Temperature Too cold to germinate or growth is slow due to cold temperatures
Seedling collapse soon after emergence Maggots feeding on seeds Seedcorn maggot
Tiny, slender, white centipede-like pests with 11 to 12 pairs of legs and prominent antennae in soil Symphylans
Shiny, slender, cylindrical, hard-bodied, yellow to brown larvae in soil Wireworms
Dark discolored roots; damping-off Seedling diseases
Seedling roots eaten Wireworms, seedcorn maggot, gopher
Leaf damage Holes or skeletonized areas on leaves; presence of greenish-yellow beetles with black spots or stripes Cucumber beetles
Leaves curled downward; sticky, shiny leaves; presence of aphids or whiteflies Whitefly, aphids
Leaves cupped upward; ragged-looking plants Thrips, possible herbicide injury
Threadlike twisting lines in leaves Leafminers
Stunted seedlings Sticky, shiny leaves; presence of aphids or whiteflies Whitefly, aphids
Ragged-looking plants, distorted leaves Thrips, possible herbicide injury
Seedling leaves or stem eaten Seedling leaves or stem gone or mostly eaten Darkling beetles, rabbits, wireworms, armyworms, cutworms
Seedling cut off below or at soil line Presence of smooth-skinned caterpillars that roll into a c-shape when disturbed Cutworms
Presence of black or bluish-black to rusty brown beetles Darkling beetle
Atypical color Abnormal coloring of any kind Seedling diseases, nutrient imbalance, herbicide toxicity, viruses, boron, or salt toxicity
Text Updated: 11/18