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Noncytokinetic injury: sparing effect of dose fractionation for delay of pupariation of the fleshfly, Sarcophaga bullata Parker.

Pupariation delay after irradiation of larvae of dipterous insects represents a precisely measurable form of noncytokinetic injury. A sparing effect of dose fractionation was demonstrated for this phenomenon. Sarcophaga bullata Parker were irradiated during the precritical period of the last larval instar. Pupariation delay is a function of dose from 1400 R to 4200 R; a sparing effect of dose fractionation was demonstrable over this entire range of doses.