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How to Manage Pests

UC Pest Management Guidelines

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Dry bean seedling, first leaf stage.

Dry Beans

Monitoring During Stand Establishment

(Reviewed 12/08, updated 12/08)

In this Guideline:

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 shallowly or deeply planting technique
tiny, slender, white centipedelike 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 centipedelike 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 gophers
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, possible herbicide injury, seed planted too deeply, not enough moisture
seedling collapse soon after emergence maggots feeding on seeds seedcorn maggot
tiny, slender, white centipedelike 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 off wireworms seedcorn maggot gophers
leaf damage holes or skeletonized areas on leaves; presence of green beetles with black spots cucumber beetles
leaves curled downward; sticky, shiny leaves; presence of aphids 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 aphids
ragged-looking plants thrips, possible herbicide injury
seedling leaves or stem eaten seedling leaves or stem eaten off darkling beetles, rabbits, wireworms
seedling cut off below or at soil line presence of smooth-skinned caterpillars; roll into a C-shape when disturbed cutworms
presence of black or bluish-black to rusty brown beetles darkling beetles
atypical color abnormal coloring of any kind seedling diseases, nutrient imbalance, herbicide toxicity, viruses, boron or salt toxicity

IMPORTANT LINKS

PUBLICATION

[UC Peer Reviewed]

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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