Relation of Temperature to the Development of the Plum Curculio in Apples1

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Abstract
The rate of development of the immature stages of the plum curculio (Conotrachelus nenuPhar) increases with each increase in temperature above 55°F. The number of punctures by adults in unsprayed apples also increases with the temperature but less rapidly than the number of eggs deposited. When confined with apples sprayed with lead arsenate, the number of days which the beetles live and the number of punctures which they make before death decreases with each increase in temperature and each increase in the concentration of lead arsenate. By applying sprays or dusts just before the first period of high temperatures following the petal fall stage, fruit growers have decreased injury by this insect 11 to 20 per cent, compared to less timely applications.

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