. Insect pests of farm, garden and orchard . Fig. 112.—Toxoptcra gramiaum: o, newly born, and b, adult wingless greenbug, greatly enlarged. (After S. J. Hunter.) observed to reproduce with a daily mean temperature barelyabove freezing. Natural Control.—The natural control of this most destructivepest involves a most interesting relationship between temperatureand the development of the parasites which check its development. The green bug in normal years—that is, when its breedingbegins in spring—is effectively held in check by its natural ene-mies, and notably by a minute, black wasp-like inse
. Insect pests of farm, garden and orchard . Fig. 112.—Toxoptcra gramiaum: o, newly born, and b, adult wingless greenbug, greatly enlarged. (After S. J. Hunter.) observed to reproduce with a daily mean temperature barelyabove freezing. Natural Control.—The natural control of this most destructivepest involves a most interesting relationship between temperatureand the development of the parasites which check its development. The green bug in normal years—that is, when its breedingbegins in spring—is effectively held in check by its natural ene-mies, and notably by a minute, black wasp-like insect, LysiphlebustestaceipesCress. (Fig. 113), that deposits eggs singly in the green 154 INSECT PESTS OF FARM, GARDEN AND ORCHARD bugs, the grubs hatching from the eggs feeding internally on thebug and destroying it (Figs. 115, 116). Other natural enemies arethe larvae of certain predaceous flies, and the larvae and adults oflady-beetles. The little wasp-like parasite first mentioned, how-ever, is the one that keeps the green bug in
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