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IPM Survey Insect Update (06/15/17)

IPM Survey Insect Update

Wheat:  Cereal aphids were present in 8% of the wheat fields surveyed by the IPM scouts in North Dakota. Aphid infestation levels are low overall and as high as 16% of stems with at least one aphid present. The action threshold for cereal aphids in small grains is 85% of the stems with at least one aphid present. Continue field scouting from stem elongation through the heading stage of wheat. Aphid populations at or above the thresholds during these growth stages will result in economic injury to plants. The greatest risk of yield loss from aphids feeding on grains is in the vegetative to boot stages. After the onset of flowering, significant yield losses do not occur.

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Grasshoppers were observed in 20% of the fields surveyed by the IPM Scouts throughout North Dakota. Sweeping for grasshopper nymph ranged from 0-60 nymphs per 4 sweeps. In field ditches, an action threshold is 50-75 nymphs per 4 sweeps (equivalent of one square yard). Overall, infestations are low in most areas, except for one hot spot in Benson County.

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Soybean:  One soybean aphid was detected in 1 field in Cass County at 3% of the plants infested in North Dakota. It also was reported at low levels of infestation in SW MN (Source B. Potter, UMN). Soybean aphids are beginning to move out of the buckthorn (overwintering host) and into soybean fields. Start scouting for soybean aphids. For a refresher on scouting, watch the NDSU Extension YouTube video on Scouting for Soybean Aphids.

 

Janet J. Knodel

Extension Entomologist

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