Gamma Irradiation of the European Chafer.1 1. Irradiation of Third-Stadial Larvae, with Observations on Spermatogenesis2,3

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Gamma irradiation levels for LD50 values on 3rd-stadial lanae of Amphimallon majalis (Razoumowsky) were 3300 rad (3.3 krad) for fall-collected individuals and 7.1 krad for spring-collected individuals when exposed as mature 3rd-stadial grubs approaching the prepupal stage. Serial sections of grubs exposed to doses of 0.5 to 50 krad all showed visible cytological injury to the germinal cells with pycnotic nuclei present in the treated testicular follicle. Male 3rd-stadial grubs were consistently more susceptible to gamma irradiation than females; exposure to I krad in thc former produced comparable effects in emergence as 2.5 krad in the latter. Both male and female adults emerging from grubs treated at 2.5 had had deformed wings. Grubs exposed to lower doses produced beetles with slightly shorter elytra than adults from nonirradiated grubs. Dose requirement for completely sterilizing larvae was higher than that for completely inhibiting metamorphosis.

Document Type: Research Article

Publication date: August 1, 1971

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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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