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While contact insecticides are useful, it is impossible to reach the nymphs in the curled leaves which are protected still further by wax and honeydew. In New Jersey almost complete killing was secured in one case by fumigating with tobacco smoke as for aphids while the trees were in storage and heavenly infested by over wintering adults. Hydrocyanic acid gas has also been used with success (See Review of Applied Entomology, SeriesA, Vol.II,p.48). It is the practice of some firms to have their men go over infested trees and pick off all curled infested leaves, but this is a slow process in a large establishment.
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