Effect of mating and parasitism regimes on progeny production and sex-ratio of Campoletis chlorideae Uchida

Dhillon, M K and Sharma, H C (2011) Effect of mating and parasitism regimes on progeny production and sex-ratio of Campoletis chlorideae Uchida. Indian Journal of Experimental Biology, 49 (10). pp. 786-790. ISSN 0019-5189

Preview

PDF - Published Version Download (79kB) | Preview

Abstract

The ichneumonid parasitoid, C. chlorideae is an important natural enemy of pod borer/bollworm, Helicoverpa armigera (Hubner) in different agro-ecosystems. The sex-ratio of parasitoids has an important bearing on the population build up of the natural enemies for biological control of insect pests. Therefore, the present studies were conducted to gain an understanding of the influence of mating behaviour and abundance of the insect host on fecundity and sex-ratio of the parasitoid, C. chlorideae. There was no significant influence of number of matings and abundance of the insect host on cocoon formation, adult emergence, and larval and pupal periods of C. chlorideae. However, fecundity and female longevity were significantly influenced by mating and abundance of the insect host. There was a significant and positive correlation (r = 0.84**) between longevity and fecundity of C. chlorideae females. The unmated C. chlorideae females produced only males. Nearly 20% of the females that had mated twice were able to parasitize the H. armigera larvae successfully. The sex-ratio of the progeny from females that had mated twice was male biased. Females mated with males from the unmated females produced significantly less numbers of females than those mated with males from the fertilized females, indicating genetic regulation of sex-ratio in C. chlorideae.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Campoletis chlorideae; Courtship behaviour; Helicoverpa armigera; Oviposition behaviour; Parasitoid; Progeny production; Sex-ratio
Subjects:	Others > Agriculture-Farming, Production, Technology, Economics
Depositing User:	Users 6 not found.
Date Deposited:	11 Oct 2011 07:56
Last Modified:	11 Oct 2011 07:56
URI:	http://oar.icrisat.org/id/eprint/2259
Official URL:	http://nopr.niscair.res.in/handle/123456789/12868
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	Thanks are due to Messrs V. Venkateshwara Rao and S.V.N. Chandra for technical support during the studies and Dr David Hoisington for valuable comments on the manuscript.
Links:	Author

View Statistics

Actions (login required)

View Item