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Damage by Lecanium coryli to Ash in floodland forests.

, : Damage by Lecanium coryli to Ash in floodland forests.. Vestn. csl. zool. Spolec, 10, 156-65

Ash is the chief host of L. coryli in the floodland forests of Czechoslovakia. Mass increase of the insect occurs in cycles of between 10 and 20 years, and at peak periods other trees and shrubs are also severely attacked. The present paper deals mainly with the damage caused in tissues of Ash twigs by the sucking mouth-parts of the coccid. Serious damage is caused only by the adolescent female, which may increase 10-15 times in volume in the course of one month.


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