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Scout for Cereal Aphids and Soybean Aphids (07/04/19)

The IPM Scouts have observed more field sites with cereal aphids in wheat / barley in southwest, north central and southeast areas of ND, and soybean aphids in soybean in south central, southeastern and northeastern ND.

The IPM Scouts have observed more field sites with cereal aphids in wheat / barley in southwest, north central and southeast areas of ND, and soybean aphids in soybean in south central, southeastern and northeastern ND. Populations are still low for both cereal aphids and soybean aphids, but this is the time to start scouting! See IPM scouting maps on next page.

For more information, consult last week’s article on cereal aphids and soybean aphids in the NDSU Extension Crop & Pest Report Issue 8, June 27, 2019.

Cereal Aphid:  Scouting should begin as soon as cereal aphids are detected and continue up through the heading stage of wheat and barley. Cereal crops are most susceptible to aphid feeding injury from the vegetative to boot stages. Economic Threshold:  To protect small grains from yield loss due to aphid feeding, the treatment threshold is 85% stems with more than one aphid present, prior to complete heading. Heavy infestations of cereal aphids can reduce grain quality (protein and test weight), especially in early growth stages of cereal grains.

Soybean aphids:  Start scouting fields in the V3 to V4 crop stage to determine if soybean aphids are present in fields. Economic Threshold: R1 (beginning of flowering) to R5 (beginning seed) = average of 250 aphids per plant and when populations are actively increasing in 80% of field.

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Janet J. Knodel

Extension Entomologist

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