Insect pests of farm, garden and orchard . )olIs, and they seem to l)e increasing in num-bers and effectiveness as they become adapted to living upon theweevil, as they are all native insects which prey upon nearly. Fig. —Chain ciilli\:it()r fi)r use in drawing \v(>pvil infested .s((Vi:ues to centerof row. (After Hunter, [. S. Dept. Agr.) related species of weevils unci other insects. A., many as two-thirtlsof the immature stag(>s have \)Qvn destroyed by th(>m in certainfields, though ordinarily not o\er ) j)cf cent of the total are para-sitized. Several si)ecies of aiils also fee
Insect pests of farm, garden and orchard . )olIs, and they seem to l)e increasing in num-bers and effectiveness as they become adapted to living upon theweevil, as they are all native insects which prey upon nearly. Fig. —Chain ciilli\:it()r fi)r use in drawing \v(>pvil infested .s((Vi:ues to centerof row. (After Hunter, [. S. Dept. Agr.) related species of weevils unci other insects. A., many as two-thirtlsof the immature stag(>s have \)Qvn destroyed by th(>m in certainfields, though ordinarily not o\er ) j)cf cent of the total are para-sitized. Several si)ecies of aiils also feed on the immature stages,20 to 30 per cent of those in fallen scpuires and bolls often beingdestroyed h}- 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 i
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