Pink Bollworm: Irradiation of Laboratory and Native Males

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Adult males from 3 laboratory strains (Sooty, APHIS, and WCRL) of Pectinophora gossypiella (Saunders), and from 3 sources (live trapped, from infested bolls, and overwintered in diapause) of native males were irradiated with 0–42 krad in increments of 7 krad in a cobalt-60 gamma irradiator. In these laboratory tests, the males were crossed with untreated females of the WCRL strain and held for 1 week for observations of mortality, mating, sperm transfer, and oviposition. All 3 strains of laboratory reared males mated more frequently than native males although sperm transfer was comparable. However, untreated females crossed with untreated native males oviposited significantly fewer eggs than similar females crossed with laboratory males. Irradiation of laboratory males with doses of 21–42 krad reduced oviposition significantly from crosses with untreated females while similar crosses with irradiated native males did not show significant reductions in oviposition (due to the highly variable oviposition from these crosses). The sterilizing effects of the irradiations were generally similar regardless of strain with ca. 50% egg hatch after irradiation with 14 krad (ca. 60% of control hatch), and irradiation with 42 krad resulted in complete sterility (with the exception of native live trapped males with 2% egg hatch). These results indicate that laboratory colonization changes the radiation response of pink bollworm males very little. The dominant mutant, Sooty, appeared to have no effect on radiation response.

Document Type: Research Article

Publication date: December 15, 1980

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