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Show - - - f HOW TO CONTROL THE GRAPE LEAF FOLDER (Trepart'J by the Vnite.i States Depart- ment of Agriculture.) The grape leaf folder, n small I "worm" which folds portions of grape- j vines over it, feeding within this shelter, shel-ter, can be controlled satisfactorily, j say entomologists of the United States ; leparttnent of agriculture. The pest is j the larva of a brown moth. Spraying ! regularly with arsenical solutions. crushing the larvae by hand in the j folded leaves during the growing sea- ' son, and burning till dead leaves anil 1 trash under the vines in the fall, are' Lite control measures recommended in a recent publication, department Bulle- I tin Xo. 419, by J. F. Strauss. j A satisfactory arsenical for vise in combating the leaf-folder is arsenate 1 The grape loaf folder is distiibcrir-iT . throughout the United States, but is most troublesome in the central anil middle Atlantic states. It attacks Ioi& wild and cultivated grapes and a few-other few-other plants, including the Virginia creeper. It is injurious to the fruit the grapevines attacked, since it e'e-stroys e'e-stroys the foliage at a time when ibis is most needed. io ripen the fruit irvp-erly. irvp-erly. Often as much as four-fifths ov the foliage is destroyed. The moth, of which the grape leaf folder is the larva', has dark brvinj. opalescent w ings, bordered with white. The body is black crossed by two white bands in the female and one in tin male. The egg is very minute. T!i fully grown, larva is about art ii?clr :. : 1 '.-"'V :k - ; : !?- - -:: . : - ' - - r ;. . ? 5k7 r A Grape Leaves Recently Folded by Larvae D, Effect on Grape Leaves ot Attack bv Larvae. of lead. This may well be applied in a fungicide such as Bordeaux mixture, a single application then serving its a treatment for disease and other insect pests. The first application should be made shortly after the blossoms fall in the spring. This should dispose of the first brood of grape loaf folders effectually,. ef-fectually,. but, if the pest appears biter, the application should be repeated. It Is advisable to burn the dead leaves In autumn, because the insect winters over in its pupal stage in the ground litter. Several parasitic enemies , of the insect have been discovered. long, yellow-green on the sides ami somewhat darker above with scattered, line, yellow hairs on each segment. The larva begins folding th? leaf when about two weeks old. This iy done by spinning line silken throuds-across throuds-across a portion of the loaf near the edge, each strand being shorter tlian Unit preceding. This procedure pr.l-ually pr.l-ually draws the leaf over. The fnideii portion of the leaf Is then inado fast I to the loaf proper by shorter Mn(nd-of Mn(nd-of silk. Within this shelter the Uirva. feeds, skeletonizing' the portions of hr leaf within reach. |