Insect pests of farm, garden and orchard . - them. The ants destroy ninny more in the fallens<juares than in those hanging on the plants, so that the tlroppingof tlie squares aids their good work as well as exposes the scjuaresto the heat of the sun. Usually about 70 per cent of the infested s((uares drop, and inthese 70 to SO per cent of the immature stages are destroyed bynatural * See W. D. Pierce, Studies of Parasites on the Cotton Hull A\eevil,Bulletin , Bureau of Ilntomology, U. S. Dept. Agr. t See W. E. Hinds, Some Factors in the Natural Control of the MexicanCotton Boll
Insect pests of farm, garden and orchard . - them. The ants destroy ninny more in the fallens<juares than in those hanging on the plants, so that the tlroppingof tlie squares aids their good work as well as exposes the scjuaresto the heat of the sun. Usually about 70 per cent of the infested s((uares drop, and inthese 70 to SO per cent of the immature stages are destroyed bynatural * See W. D. Pierce, Studies of Parasites on the Cotton Hull A\eevil,Bulletin , Bureau of Ilntomology, U. S. Dept. Agr. t See W. E. Hinds, Some Factors in the Natural Control of the MexicanCotton Boll Weevil, Bulletin 74, Bureau of Entoniologj^, U. S. Dept. Agr. INSECTS INJURIOUS TO COTTON 269. Control.—By far the most important measure in the control ofthe boll weevil is the destruction of the plants in the fall assoon as the cotton can be both destroys the weevilsand prevents their increase. Thestalks should be plowed out andburned as soon as possible. It iswell to plow out all ])ut a rowhere and there upon which theweevils will concentrate, then assoon as the piles are dry enoughto burn, cut the remaining rowsand l)urn at once. In this way thegreat bulk of the adult weevilsand all of the immature stagesin the squares and l)olls ai-edestroyed. The few escaping wee-vils will be starved out befoic theweather Ixcomes cold enough iuvthem to hil)ernate, or will be soweakened as to die in hil) Wilmon Newell, in Louisiana, that where the weevilswere forced into hibernation on October 15th only 3 per centsurvived the winter, but that when the destruction of the stalkswas put off until after December b)th, 43 per cent survived, withproportional numbe
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