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The Japanese Weevil Pseudocneorhinus bifasciatusRoelofs1

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New information was obtained on the biology of the weevil (Pseudocneorhinus bifasciatus Roelofs) infesting ornamentals in New Jersey in 1956and 1957,The insect hibernated in the adult and egg stages in debris on the ground and as young larvae in the soil beneath infested shrubs. The overwintering weevils resumed feeding on the first hot day of spring, and continued to feed and oviposit throughout the summer, The larvae hatching from these eggs were at most only half grown by the end of August, The eggs deposited in September and October started hatching in the fall and completed hatching in early spring, The larvae developed in the soil beneath infested plants, feeding on their roots. Pupation in this midsummer brood began in early June, and the peak of emergence occurred from early to mid-July.

Larvae, prepupae, and pupae were found only in the soil beneath infested plants, and occurred to depths of at least 9 inches. As many as 150 larvae per square foot, and 51 weevils per yard of privet hedge, were found, Chlordane at 10 pounds per acre in the soil beneath infested plants was an ineffective control.

Document Type: Research Article

Publication date: August 1, 1959

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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