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IJEB Vol.49 [2011] >
IJEB Vol.49(10) [October 2011] >
| Title: | Effect of mating and parasitism regimes on progeny production and sex-ratio of Campoletis chlorideae Uchida |
| Authors: | Dhillon, M K
Sharma, H C |
| Keywords: | Campoletis chlorideae
Courtship behaviour
Helicoverpa armigera
Oviposition behaviour
Parasitoid
Progeny production
Sex-ratio |
| Issue Date: | Oct-2011 |
| Publisher: | NISCAIR-CSIR, India |
| 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. |
| Page(s): | 786-790 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Source: | IJEB Vol.49(10) [October 2011]
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