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Grasshopper Hot Spots (06/28/18)

The NDSU Extension IPM scouts are finding increasing levels of grasshopper nymphs (immatures) in areas of the state that missed the rains.

Grasshopper Hot Spots

The NDSU Extension IPM scouts are finding increasing levels of grasshopper nymphs (immatures) in areas of the state that missed the rains (see map). Grasshopper nymphs are easy to observe in the ditches and the field edges now. As ditches are mowed, nymphs are moving into field edges. In these hot spots, treating field edges are recommended when the following action thresholds are reached for grasshopper nymphs:

 

  • 50 - 75 nymphs per square yard in ditches (or adjacent non-crop areas)
  • 30 - 45 nymphs per square yard in the field.

 

Nymphs are generally easier to control than adult grasshoppers. Scout for grasshopper nymphs in ditches and field edges through mid-July, and note any defoliation on crops.

knodel.1

Janet J. Knodel

Extension Entomologist

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