Bug Scout 1979
It May Be A Grasshopper Year
(Tom Turpin, Entomologist, Purdue University)
You're the one who told me grasshoppers would feed on almost anything.
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July 21, 1979

To spray or not to spray grasshoppers-that is the question!  Most grasshopper control recommendations are based on percentage of defoliation.

The need for control action also depends on cost of control, the price of the crop, and stage of plant growth.  Consider soybeans selling at $6 per bushel with the cost of control at $6 per acre.

Control should provide an economic return when defoliation reaches 40% to 50% at the three-to-four-node stage.  When the plant begins to flower the action level is lowered to 25% to 35%.  When beans begin to form in the pod, the action level is 15% to 25%.

Since grasshoppers often move from grass crops or roadsides, the edges of fields are infested first.  Spray only the part of the field needing treatment unless you have extra money lying around.


by Tom Turpin, Entomologist, Purdue University

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