Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . ng. Later theyare open to destruction by the application of hotwater, insect powder, or kerosene emulsion. The Wavy-striped Flea-beetle. Phyllotreta little pest does not by any means confine itsdepredations to the cabbage, but attacks turnip, mus-tard, radish, and various other plants as well. It isrepresented magnified at Fig. 104, b, and is a small,shining black beetle, one tenth of an inch long, witha broad, yellow, wavy, longitudinal stripe on eachwing-cover. It
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . ng. Later theyare open to destruction by the application of hotwater, insect powder, or kerosene emulsion. The Wavy-striped Flea-beetle. Phyllotreta little pest does not by any means confine itsdepredations to the cabbage, but attacks turnip, mus-tard, radish, and various other plants as well. It isrepresented magnified at Fig. 104, b, and is a small,shining black beetle, one tenth of an inch long, witha broad, yellow, wavy, longitudinal stripe on eachwing-cover. It feeds upon the surface of the leaf,gnawing out little females deposit theirminute, oval, whitish eggsupon the roots of variouscruciferous plants, such asradish, cabbage, turnip,etc., and the larvse whichhatch from them feed up-on these roots, sometimes Fig. 104. Wavy-striped Flea-beetle:doing SeriOUS damage m a, larva; 6, beetle. this way. The full-grown larva (Fig. 104, a) is aboutone-fourth of an inch long, with a yellowish-whitebody, and brown head. There appear to be two ormore broods each INJURING THE LEAVES. 197 Remedies.—Tobacco powder is the best remedyfor these little pests. If applied freely to the plants,it will drive them away. In seasons when the beetlesare not too thick, dusting the plants with dry, un-leashed wood ashes, or lime or plaster, will also keepthem off, and tobacco decoction is a good remedy. Cabbage Cut-worms. The cabbage is subject to attack by nearly a dozenspecies of cut-worms, nearly all of which, however,are similar in habits and history, and may wellbe treated of collectively. They are all larva? ofmedium-sized, night-flying moths, and are ratherthick, naked worms of the general form of Fig. 105, curl up whendisturbed. The eggsare deposited gener-ally on the branchesof trees and shrubs,the larva? descend-ing to the ground insearch of food assoon as of them, feedupon grass or cloverwhen young, becom-ing, a
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