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Early Control of Grasshopper Necessary
Grasshoppers will typically begin to hatch in this area in mid May. Recent research in Montana has found that rangeland grasshoppers (which include a couple of the species injurious to field crops) are nearly all hatched 10 days after common lilac have begun to bloom. This should be an easy method of alerting farmers and ranchers to the time when field checking to assess grasshopper populations needs to begin.
Young developing grasshoppers are called nymphs. Nymphs differ very little from adults, except for being smaller and having wing pads instead of wings. It takes about 40 to 60 days to reach the adult grasshopper stage.
Plan to control grasshoppers while they are still young nymphs and confined to their hatching sites along fence rows and in road ditches. By applying insecticide at this stage control will be good and the cost will be much less.
For more information see the Field Crop Insect Management Guide at http://www.ext.nodak.edu/extpubs/plantsci/pests/e1143w1.htm
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