Some Effects of Irradiation on Cochliomyia hominivorax

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Abstract
Pupae of Cochliomyia hominvorax (Coquerel), 1-, 29-, 52-, 76-, and 97-hours of age, were exposed to equal multiple and single doses of irradiation varying from 600 to 7800 r (Roentgen rays). Newly emerged eggs were exposed for 1-, 2-, 3-, and 4-minutes at 531 r per minute. Five-hour-old eggs were exposed in minute intervals from 1 to 15 minutes at 539 r per minute. Unfertilized ova and sperm were exposed to 531 r, 600 r and 1,062 r by irradiation of 8-day-old flies. Generally multiple irradiation was more harmful to pupae than an equal single dose. Unfertilized eggs seemed more susceptible to radiation than newly laid eggs. Five-hour-old eggs appeared less susceptible than unfertilized or newly laid eggs.