TY  - JOUR
AV  - public
A1  - Dhillon, M K
A1  - Sharma, H C
TI  - Effect of mating and parasitism regimes on progeny production and sex-ratio of Campoletis chlorideae Uchida
UR  - http://nopr.niscair.res.in/handle/123456789/12868
JF  - Indian Journal of Experimental Biology
SN  - 0019-5189
PB  - National Institute of Science Communication and Information Resources
N1  - 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.
N2  - 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.
KW  - Campoletis chlorideae; Courtship behaviour; Helicoverpa armigera; Oviposition behaviour; Parasitoid; Progeny production; Sex-ratio
Y1  - 2011///
SP  - 786
ID  - icrisat2259
EP  - 790
VL  - 49
IS  - 10
ER  -