The Sex Ratio of a Hymenopterous Parasitoid, Campoletis perdistinctus, as Affected by Photoperiod, Mating, and Temperature1,2
- 15 November 1971
- journal article
- Published by Oxford University Press (OUP) in Annals of the Entomological Society of America
- Vol. 64 (6) , 1373-1376
- https://doi.org/10.1093/aesa/64.6.1373
Abstract
Laboratory studies were conducted to determine the factors affecting the sex ratio of Campoletis perdistinctus (Viereck). The proportion of males is usually greater than that of females in field-collected insects and laboratory-reared colonies. Variables studied included photoperiod, temperature, and mating. Results indicated that a 12:12 (L:D) photoperiod produced offspring with the greatest percentage of females. Offspring produced frcm unmated females were all males, and females might or might not be produced after copulation. The exposure of older females to males for fertilization yielded offspring with a greater percentage of females. Temperatures used (18–32°C) did not greatly alter the sex ratio produced. A temperature of 27°C was found to be the most suitable for the production of the greatest numbers of C. perdistinctus.Keywords
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