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Grasshoppers on the Move! (08/16/18)

Grasshoppers have been increasing in parts of North Dakota (see IPM map) and infestations are reported in field edges of soybeans, sunflowers and field corn.

Grasshoppers on the Move!

Grasshoppers have been increasing in parts of North Dakota (see IPM map) and infestations are reported in field edges of soybeans, sunflowers and field corn. The recent hot, dry weather favors higher populations of grasshoppers and can lead to hot spots or even localized outbreaks. As cereal grains are dried down and harvested, producers should be aware of grasshopper movements into row crops. According to the USDA NASS North Dakota Crop, Livestock & Weather Report of August 13th, cereal grain harvest progressed with barley at 52% harvested, oats at 41% harvested, spring wheat at 29% harvested, and durum wheat at 9% harvested.

Now is a good time to scout row crops for grasshopper infestation. Early detection is critical for preventing yield loss. Grasshopper damage usually starts in field margins and move into fields. Grasshoppers feed on leaves/pods/kernels, which can be completely destroyed. An economic level of adult grasshoppers is 21-40 per square yard in field margins and 8-14 per square yard in the interior of field.

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Janet J. Knodel

Extension Entomologist


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