Effect of X-Ray Exposure on the European Corn Borer12

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Abstract
When untreated virgin females were mated to male moths of the European corn borer ( Ostrinia nubilalis (Hübner)) treated 1 day after emergence with 32,000 r of X-rays, only 1% of eggs hatched. Irradiated males competed equally with the untreated males for females. Moths caged together at a ratio of 8 irradiated males to 4 untreated males to 8 untreated females resulted in 39.4% hatch of eggs. Survival of the irradiated males compared favorably with that of untreated males under laboratory conditions. Exposure of pupae of both sexes to X-rays resulted in a reduction in percent egg hatch as the dose was increased. Female pupae were more susceptible to irradiation than males. The percent egg hatch varied with age of pupae at treatment, younger pupae being more susceptible to irradiation than older pupae.

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