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Further Studies on Susceptibility of European Fruit Lecanium, Lecanium corni Bouché, to Oil1

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The European fruit lecanium, Lecanium corni Bouché, over winters as second in star nymphs on the bark of the host. In early spring these crawl actively till the buds develop to the green tip stage and then tend to settle and secure themselves to the hark with a wax like secretion. Weight of the scale increased at a relatively slow, uniform rate till the last molt and then weight increased rapidly till the scale was fully grown. Oil of 70-second viscosity applied as water emulsions of different concentrations at intervals during the growing period showed decreasing control efficiency A sharp decrease in susceptibility to oil occurred shortly after the scales had settled in permanent locations and about 3 weeks before rapid growth began. Sealing the border of scales to the bark with later prevented penetration of oil to the ventral surface and greatly decreased susceptibility to oil. It is suggested that decreased susceptibility of this scale to oil between the dormant and delayed dormant period, previously observed in orchards, is caused mainly by its fastening itself more securely to the bark prior to the final molt and thus preventing oil from reaching the ventral surface.

Document Type: Research Article

Publication date: April 1, 1963

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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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