. Débuts dans l'agriculture. L'agriculture. Les ennemis des plantes 211. (1) Côté, ou mécanique, méthodes. - Les insectes sont recueillis et détruits par de très nombreux types de méthodes à la main. Parfois ils sont simplement cueillies à la main, comme de la pomme de terre dans le jardin. Casseroles collante peut être tracé à travers champs pour recueillir les sauterelles, ou tenue près de raisins et de la feuille-hoppers jarred dans eux. Bandes adhésives placées sur les arbres vont prendre de grands nombres de sauterelles papillons comme ils rampent jusqu'aux troncs. Les feuilles peuvent être placées sous les petits pruniers et les arbres de sorte que les bébés en pot la prune insec

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. Beginnings in agriculture. Agriculture. INSECT ENEMIES OF PLANTS 211. (1) Hand, or mechanical, methods. — Insects are gathered and destroyed by very many different kinds of hand methods. Some- times they are merely picked by hand, as potato beetles in the garden patch. Sticky pans may be drawn across fields to collect grasshoppers, or held near grape vines and the leaf-hoppers jarred into them. Sticky bands placed about trees will catch large num- bers of canker-worm moths as they crawl up the trunks. Sheets may be placed under small plum trees and the trees jarred so that the curculio insects will fall into them. Strips of tar poured along small ridges plowed up all about a field will prevent chinchbugs from passing. Many other hand, or mechan- ;'?ye.7i ^- a i <"W ical, methods are employed. They (OT||i # b%y' ^^v are most useful in small areas or ^'li^^ f-C ^^ ^^'^ ^ ' * V gardens. Fig. 106. — The moths of canker- (2) Farm practices. — We have learned that crop rotation helps to destroy weeds. It also helps to destroy insects which attack such crops as corn, clover, wheat, and potatoes. When the insects find their favorite crop gone and replaced by one they do not hke, they are without food and starve to death. Good tillage destroys many insects and grubs that live in the soil, such as wire worms and white grubs. Canker-worms, which attack fruit trees, live in the soil part of the time during their de- velopment, and are easily killed by tillage. Sometimes crops can be planted early enough so that they will be able to resist the attacks of insects when they come. Or strips of the crop may be sown around or near the field to attract the worms stopped by sticky bandlin their progress up a tree.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Mann, Albert Russell, 1880-. New

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