Bug Scout 1979
Find Economic Threshold
(Tom Turpin, Entomologist, Purdue University)
Aha! One of the *!#! little rascals is still kicking!
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January 20, 1979

Pesticides don't increase crop yields.  Pesticides can prevent yield losses when used against pest populations that reach damaging levels.

Pest managers refer to pest population levels where treatment is required as "economic thresholds."  An economic threshold is the point at which the yield loss prevented will pay for the cost of the treatment.  Pesticide application to pest populations below the economic threshold means money wasted - straight out of the profit column.

Find out the economic thresholds for your crops.  Thresholds vary according to the stage of plant growth, stage of the pest, and according to the type of growing season.

Some crop producers like to kill bugs or weeds every chance they get.  Killing pests at populations below the economic threshold doesn't make "cents."

by Tom Turpin, Entomologist, Purdue University

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