File:Control of the Japanese beetle on fruit and shade trees (1932) (20665940606).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 ON FRUIT AND SHADE TREES 9 cially well protected. An application of 25 pounds of dry mix, 10 l^ounds of hydrated lime, 3 pounds of lead arsenate, and 100 gallons of water should be given not later than July 4 in a season of normal weather conditons. It is much easier to protect trees when the foli- age is dense and vigorous than when the trees are weak and under- nourished. EARLY VARIETIES No sprays have been found to be effective against Japanese beetles on early varieties of peach trees (those varieties maturing before Elberta). The bee- tles are abundant in the orchards at the time early peaches are harvested and are especially at- tracted to the rip- ening fruit. (Fig. T.) It has been im- possible to elimi- nate this attractive- ness by the use of chemicals; and in- soluble spray mate- rials, when applied at this time, leave a residue that can not be removed without injury to the fruit. Members of the research staff of the Japanese beetle lab- oratory have been making an extensive search for a non- toxic repellent which leaves no objection- able residue on the peach, but without success. The great attraction that the ripening peach has for the beetle has not been overcome. Where the infestation is not too heavy, a spray consisting of milk of lime from 12 pounds of unslaked lime or 16 pounds of hydrated lime made up to 100 gallons with water has a definite repellent effect on the beetle, and may give complete protection over a period of several days. The application should not be repeated, however, as it leaves an objectionable visible residue, and unless removed by rains it reduces the market value of the fruit.
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Figure 7.—Japanese beetles clustered on peach fruit. All the fleshy part of the fruit is destroyed, leaving only the pit. Early Rose is the variety of peach shown

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