. Cooperative economic insect report. Beneficial insects; Insect pests. - 725 - STATUS OF SOME IMPORTANT INSECTS IN THE UNITED STATES APPLE AND THORN SKELETONIZER (Anthophila pariana (Clerck)) Economic Importance: This insect is of European origin and a minor pest of apples in its native habitat. It first appeared in the United States in Westchester County, New York, in 1917. By 1920, it had spread into nearby Connecticut and during 1921-22 caused apparent injury to untreated apple trees in that State. Larvae skeletonize leaves in a manner similar to cankerworms. In the United States, the inse
. Cooperative economic insect report. Beneficial insects; Insect pests. - 725 - STATUS OF SOME IMPORTANT INSECTS IN THE UNITED STATES APPLE AND THORN SKELETONIZER (Anthophila pariana (Clerck)) Economic Importance: This insect is of European origin and a minor pest of apples in its native habitat. It first appeared in the United States in Westchester County, New York, in 1917. By 1920, it had spread into nearby Connecticut and during 1921-22 caused apparent injury to untreated apple trees in that State. Larvae skeletonize leaves in a manner similar to cankerworms. In the United States, the insect is now only an occasional pest in local areas where it occurs and is evidently easily controlled. Distribution: Canada, Czechoslovakia, England, France, Germany, Japan, Netherlands, Norway, Poland, Sweden, Switzerland, Turkey, USSR and the United States (see map). Hosts: Apple seems to be the prefered host. Also recorded on pear, plum, fig, sweet cherry, mountain ash, birch, willow and hawthorn (Crataegus spp.). Life History and Habits: The biology as recorded in Connecticut is as follows: Three and possibly 4 generations appear annually; overwintering probably occurs as a pupa. Eggs are laid singly on surfaces of leaves and on leaf stalks, beginning as early as April 25. Hatching occurs in about 7 days and young larvae feed on undersurface of leaves. There are 4 instars. When larvae are about one-third grown, usually second instar, they move to the upper leaf surface, spin a light web, often curling the leaf, and feed beneath the web. Feeding consumes all except the opposite epidermis and veins. Several larvae of various sizes may often be found under a single web, especially when abundant. In many cases, a partially skeletonized leaf will be deserted for a fresh one nearby. Very early infestations are easily recognized by the irregular, scattered, DISTRIBUTION OF APPLE AND THORN SKELETONIZER (Anthophila pariana). Please note that these images are extracted from scanned pag
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