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Circadian Sensitivity and Dosage-Rate Response to X-Irradiation in the Pink Bollworm1,2

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A laboratory culture of Pectinophora gossypiella (Saunders was entrained on a photo. period of LD 14: 10. Lights-on occurred at 0530 hours and lights-off at 1930 hours. At 3-hour intervals, beginning at 2400 hours throughout a 24-hour period, male and female moths were X-irradiated with 25 kr delivered at 1.0 kr per In a separate study male and female moths were X-irradiated at 1500 hours with 25 kr at 4 different dosage rates.

A highly significant difference was observed between sexes of moths, time of X-irradiation, and dosage rates. Female moths at all times were less sensitive to X-irradiation than males, as measured by mean longevity. The time of minimum sensitivity to X-irradiation in both sexes occurred at 0600 hours, ½ hour after lights-on. Maximum sensitivity in both sexes occurred at 1200 hours, 1.5 hours after lights-off. It appeared that sensitivity to X-irradiation was correlated to moth activity.

As the dosage rate of X-irradiation was increased, the biologic damage also increased, expressed as reduced longevity. At lower dosage rates moths were able to recover and apparently repair radiation damage.

Document Type: Research Article

Publication date: August 1, 1970

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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