Insect pests of farm, garden and orchard . Fk;. 204.— The , true sex-ual female—enlarged.(After Riley, U. Agr.) 278 INSECT PESTS OF FARM, GARDEN AND ORCHARD before the winged generation appears, with some substancewhich will destroy them, the pest may be prevented from gettinga start the next season. Spraying the trees during the fall isbest, because a stronger or more caustic solution can then beapplied without danger of injury to the tree. A winter wash of 1pound of concentrated lye to 2 gallons of water may be used as aspray to advantage in killing a large share of th
Insect pests of farm, garden and orchard . Fk;. 204.— The , true sex-ual female—enlarged.(After Riley, U. Agr.) 278 INSECT PESTS OF FARM, GARDEN AND ORCHARD before the winged generation appears, with some substancewhich will destroy them, the pest may be prevented from gettinga start the next season. Spraying the trees during the fall isbest, because a stronger or more caustic solution can then beapplied without danger of injury to the tree. A winter wash of 1pound of concentrated lye to 2 gallons of water may be used as aspray to advantage in killing a large share of the eggs, but shouldnot be applied after the buds commence to swell in the spring. To. Fig. 205.—The hop plant-louse, male—enlarged. (After Riley, U. S. D. Agr.) lessen the number of eggs all wild plum-trees in the neighboringwoods should be destroyed. As soon as the crop is harvested,the hop-vines should be burned or thoroughly sprayed withkerosene emulsion, so as to kill off the males before they havebeen able to fertilize the females. For spraying the plum-trees and hop-vines kerosene emulsionhas been found very satisfactory, diluting the stock solution with15 parts of water. Fish-oil or whale-oil soap used at the rate of 1 pound to 8gallons of water will prove an effective spray against the see page 664. INSECTS INJURIOUS TO THE 279 The Hop-vine Snout-moth * The larvse of the Hop-vine Snout-moth sometimes becomevery formidable pests in the hop-field, appearing suddenly inlarge numbers and rapidly eating the foliage over a large area. They are not known to have any other food-plant than thehop and hence are only found where that plant occurs,
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