Agriculture for beginners . r 170. :?iKA\ int. <^t\i, ii-AMjOne wav of increasing the \-ield of fruit In dealing with plants, as with human beings, the greatobject should be not the cure but the prevention of disease can be prevented, it is far too costly to wait forit to develop and then to attempt its cure. Men of scienceare studying the new forms of diseases and new insects asfast as they appear. These men are finding ways of fightingold and new enemies. Young people who expect to farmshould earlv learn to follow their adnce. 172 AGRICULTURE FOR BEGIXXERS EXERCISE Ho
Agriculture for beginners . r 170. :?iKA\ int. <^t\i, ii-AMjOne wav of increasing the \-ield of fruit In dealing with plants, as with human beings, the greatobject should be not the cure but the prevention of disease can be prevented, it is far too costly to wait forit to develop and then to attempt its cure. Men of scienceare studying the new forms of diseases and new insects asfast as they appear. These men are finding ways of fightingold and new enemies. Young people who expect to farmshould earlv learn to follow their adnce. 172 AGRICULTURE FOR BEGIXXERS EXERCISE How does the squash bug resemble the plant louse? Is this a truebug? Gather some eggs and watch the development of the insectsin a breeding<age. Estimate the damage done to some crops bythe flea-beetle. What is the best method of prevention?. Fig. 171. Apple Tree showing Proper C.\re Do you know the large moth that is the mother of the tobaccoworm? You may often see her \-isiting the blossoms of the Jimsonweed. Some tobacco-growers cultivate a few of these weeds in atobacco field. In the blossom they place a little cobalt or fly-stoneand sirup. When the tobacco-worm moth %-isits this flower and sipsthe poisoned nectar, she will of course lav no more troublesome eggs. ORCHARD. GARDEN. AND FIELD INSECTS IJS SECTION XXXIV. THE COTTON-BOLL WEEVIL So far as known, the cotton-boll \vee\il, an insect which isa native of the tropics, crossed the Rio Grande River intoTexas in 1891 and 1892. It settled in the cotton fieldsaround Brownsville. Since then it has widened its destruc-tive area until now it has invaded the whole territory shownby the map on page 177. This weevil is a smallgray or reddish-brown snout-beetle hardly over a quarterof an inch in length. Inproportion to its length ithas a long beak. It belongsto a family of
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