Watch For Grasshoppers in Crops

Watch For Grasshoppers in Crops August 9, 2016

We continue to receive reports of grasshoppers in field borders moving into crop fields in parts of Nebraska. Grasshoppers will move into crop fields especially if summer rainfall has not kept border areas well watered. Use the following table to assess the likelihood that control with insecticides will be profitable.

See an earlier CropWatch article, Scout Field Borders for Grasshoppers, for more complete information.

Adult differential grasshopper
Figure 1. Differential grasshopper
Table 1. Treatment guidelines based on number of grasshoppers (nymphs and adults) per square yard.
Grasshopper Population Within Fields Field Borders Treatment Necessary? undefined
Non-economic 0-2 5-10 No
Light 3-7 11-20 Uncertain — depends on size, species, type of crop
Moderate 8-14 20-40 Probably
Abundant 15 or more 41 or more Yes