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Unit 12: Soybean Insects
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Unit 12: Soybean Insects
Carefully monitor both damaging and beneficial insects through scouting
Have knowledge of economic thresholds for insect damage and the cost of control
One insecticide application should be enough to control most infestations
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Unit 12: Soybean Insects
Guidelines for insect toleration:Up to 35% defoliation during bloomingNo greater than 20% during pod filling
Leaf feeding InsectsThree pests to worry about:
Two-spotted spider mite Bean leaf beetle Soybean aphids
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Unit 12: Soybean Insects
Spider Mites Feed on underside of the leaf Suck juices from the plant Symptoms
Yellow to whitish spotting on top side of leaf Webbing on underside of the leaf Severely infested leaves die
Bean Leaf Beetle Feeds on leaves causing defoliation
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Unit 12: Soybean Insects
Can also feed on the pod, causing scarring and seed damage
Treat when 5-10% of pods are damaged
Larvae Can feed on roots and root nodules
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Unit 12: Soybean Insects
Soybean Aphids Found for the 1st time in the U.S. in 2000 Little is known about them Eggs overwinter on buckthorn plants Can have 18 generations/yr As colonies increase, they spread Usually found on leaves and stems Feed by sucking fluid from the soybean leaves
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Unit 12: Soybean Insects
Caused crinkled/cupped leaves Have reduced yields by as much as 28% in China Very difficult to treat
Weather can cause a population crash quickly Predatory control Infestation can increase 10x in a week
Insecticide may only control for small period of time May take 2 applications for control
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Not treated
Insecticide applied
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Unit 12: Soybean Insects
Pod & Flower Feeding InsectsCause direct yield reduction, especially if
infestation occurs late in bloomingDamaging insects
Bollworms Stink bugs Mexican bean beetle Grasshoppers
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Unit 12: Soybean Insects
Green clover worm Velvet bean caterpillars
How do they cause damage?
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Unit 12: Soybean Insects
Stem Feeding InsectsRarely cause economic lossesCan puncture stem to suck juicesControl measures usually not neededProblem pests
Three-cornered alfalfa hopper Weed borer
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Unit 12: Soybean Insects
Seed & Seedling Feeding InsectsFeed on seed, seedling, plant roots, leavesUsually controlled with soil applied
insecticides or seed treatments
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Unit 12: Soybean Insects
Damaging pests Seed corn maggot Seed corn beetle Wireworm Grape colaspis White grubs Thrips Southern corn rootworm Bean leaf beetle
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