Abstract
Experiments showed that 5% granular heptachlor applied within a 2-foot radius of tree bases by portable power duster was highly effective in controlling Pissodes strobi (Peck) in plantations of eastern white pine, Pinus strobus L. Applications provided adequate control of the overwintering adults for at least 5 years. The timing of treatments had little effect on the control obtained. The greatest weeviling reduction, averaging 95%, occurred in the 2nd year after treatment. A measure of control was obtained also in plantings where only the weeviled tree and those immediately adjacent received treatment. In nearby areas where tree leaders were treated with a DDT emulsion, initial adult mortality was higher, but repopulation soon occurred. Efforts directed at controlling hibernating adult weevils in the duff at the tree base will overcome the numerous problems existing in current leader treatment methods.
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