control action threshold. Pest population level at which treatment is necessary to prevent economic loss, also called economic threshold.
cornicle. Two tubular structures located on the posterior part of an aphid's abdomen.
Consequently, there is no experimentally determined action threshold for its control with insecticides. However, because of the likelihood of severe damage in the long run, few should be tolerated.
Because of potential chronic yield effects, action thresholds for fresh and processing market blocks are identical. On smaller nonbearing trees, record the number of primary infections on 25 trees per five acres (2 ha).
 See also: Insect, Thresh, Introduction, Overwinter, Orchard
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