Biology and Control of Polistes exclamans Viereckin Arizona Citrus Groves1

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Abstract
During recent years the wasp, P. exclamans has become increasingly abundant in citrus groves in Arizona. Laborers were reluctant to harvest the fruit in the infested groves, causing a loss of fruit as high as 20% in some areas. In 1953, 12 formulations of insecticide sprays were tested for effectiveness against this wasp. Of these, 1% thanite in deodorized kerosene spray base oil was most effective and least expensive. This formulation gave a quick knock down of wasps and good control of the nest brood. Concurrent with the insecticide test program observations on the biology of the wasp was also made.

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