Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . Fig. 13.—Broad-necked Prionus, larva and pupa. After Eiley. Though usually living in the roots and trunks of the poplar and balm-of-Gilead, Mr. F. Clarkson states that at Oak Hill, Columbia County,N. Y., this borer infests the black oak, the beetle emerging at twilightduring the first two weeks in July. Their presence is quickly realized by the odor of the female, which is very power-ful, and can readily be detected 20 feet dist
Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . Fig. 13.—Broad-necked Prionus, larva and pupa. After Eiley. Though usually living in the roots and trunks of the poplar and balm-of-Gilead, Mr. F. Clarkson states that at Oak Hill, Columbia County,N. Y., this borer infests the black oak, the beetle emerging at twilightduring the first two weeks in July. Their presence is quickly realized by the odor of the female, which is very power-ful, and can readily be detected 20 feet distant. I placed a female immediatelyafter emergence in an uncovered jar, and wherever I positioned it, on the piazza orelsewhere, the males were attracted from every direction. I captured twenty males OAK-BORERS. 53 in a very few minutes. Oak Hill can not boast of a balm-of-Gilead or a Lombardy pop-lar, but it is famous for its oaks, and while it is admitted that the former trees, asmentioned by Harris, serve as food for the larvae, my observations indisputably provethat they feed also upon the roots of the oak. (Can. Ent., xvi, 95.) AFFECTING THE TRUNK. 3
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