File:Control of the Japanese beetle on fruit and shade trees (1932) (20504206658).jpg

Title: Control of the Japanese beetle on fruit and shade trees
Identifier: controlofjapanes237vanl (find matches)
Year: 1932 (1930s)
Authors: Van Leeuwen, E. R
Subjects: Japanese beetle Control; Fruit Diseases and pests; Trees Diseases and pests
Publisher: Washington, D. C. : U. S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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CONTROL OF THE JAPANESE BEETLE OX FRUIT AND SHADE TREES The female returns to the soil during certain periods to deposit eggs. The eggs hatch in about 12 days. The larvae remain near the sur- face of the soil to feed until the approach of cold weather, when they burrow deeper into the ground. There is only one generation a year. (Fig. 3.) CHARACTER OF INJURY The injury caused by the adult beetle is the result of its feeding on foliage and fruits. The leaves of trees are in part or wholly skeletonized; that is, the softer tissues of the leaf between the coarser veins are eaten. As the in- sect prefers to feed in sunny places, it first destroys the leaves at the top of the tree or plant. The remnants of the leaves soon turn brown and fall off, and a partial second crop of leaves is pro- duced. Beetle infestations have been so severe at times that large shade and fruit trees have become com- pletely defoliated within four days after being first attacked. Early ripening fruits are especially attractive to the beetle. At times the beetles collect on early apples and peaches in such large num- bers as completely to cover the fruit. The author once collected 13 tubs of beetles from 156 early peach trees in the vicinity of Moores- town, N. J., and within two
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Figure The Japanese beetle. days the trees were again heavily infested. Very little feeding by the beetle is sufficient to destroy an entire crop of early apples or peaches. Once the skin of the fruit has been broken by the insect's jaws, it has little market value. FACTORS INFLUENCING CONTROL The Japanese beetle is a difficult insect to control. There are sev- eral reasons for this: (1) The large number of insects found in the neighborhood of the crops to be protected; (2) the failure of the beetle to feed on poisoned plants; (3) the great attraction that the beetles have for each other; and (4) the large number of different kinds of plants upon which the beetles will feed. One of the chief factors which make it possible to secure protection, in spite of the countless numbers of beetles, is the repelling effect

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