. Insect pests of farm, garden and orchard . Fig. 24.—Above, a poorly kept roadside with railfence overgrown withbrambles, thus affording protection for large numbers of destructiveinsects during winter. Below, a well kept roadside, offering the leastprotection possible for destructive insects. (After Webster, U. Agr.), 36 FARM METHODS FOR THE CONTROL OF INSECTS 37 the case, it will usually be preferred to them as far as it isavailable. Clean Farming.—After a crop has been harvested there isusually some portion of the plant which is allowed to remainon the land. In this refuse the inse
. Insect pests of farm, garden and orchard . Fig. 24.—Above, a poorly kept roadside with railfence overgrown withbrambles, thus affording protection for large numbers of destructiveinsects during winter. Below, a well kept roadside, offering the leastprotection possible for destructive insects. (After Webster, U. Agr.), 36 FARM METHODS FOR THE CONTROL OF INSECTS 37 the case, it will usually be preferred to them as far as it isavailable. Clean Farming.—After a crop has been harvested there isusually some portion of the plant which is allowed to remainon the land. In this refuse the insects peculiar to the crop oftenfeed and multiply until killing frost and then hibernate overwinter, ensuring injury to similar crops on the same land the. Fig. 25.—A field of cabbage stumps in midwinter, affording ideal condi-tions for the hibernation of cabbage pests. next year. Thus the wheat joint worm and the corn stalk-borerl>oth winter in the stubble of those crops, and the chinch-bugcommonly hibernates in the butts of corn stalks, all of whichmay be largely controlled by burning the stubble. Possiblythe most important means of control of the cotton bo-11 weevilis the destruction of the stalks in the fall as soon as the cottoncan be picked, thus preventing the weevils feeding and starvingthem out l^efore they are ready to hibernate, and removing theshelter for hibernation. Thus all the remnants of a crop such as 38 INSECT PESTS OF FARM, GARDEN AND ORCHARD stubble, vines, leaves, or stumps, as may be, should be removedfrom the field as soon after it is harvested as possible. As manyinsects hibernate in such rubbish, this fact may sometimes beutilized by thoroughly cleaning a field and leaving one or twopiles of rubbish in whic
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