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A Study of the European Fruit Lecanium Scale, Lecanium corm, on Prune1

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The population fluctuations of the scale insect Lecanium corni Bouché, a common orchard pest, were studied for the period 1958-63, Regular samples on a year-round basis, using 6-in. lengths of twigs, or leaves from the terminals, showed a fluctuation from 17 to 13,985 scales per unit. When the scale population was at a minimum no parasites could be found. The principal limiting factor appears to be high temperatures in June, at which time the scale crawlers arc hatching and migrating to the leaves. From field observations the critical temperature appears to be 90°F; the greater the number of days of 90° or more, the higher the mortality. Two factors, the parasites and high June temperatures, supplement each other and, usually, appear to create sufficient environmental resistance to hold the pest below the economic injury level in the coastal area without the use of insecticides. Under such conditions, an index of I scale per in. of twig justifies the use of a dormant spray.

Document Type: Research Article

Publication date: December 1, 1964

More about this publication?
  • 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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