Superior Strain Selection of the Egg Parasitoid Trichogramma chilonis Ishii - Biological Parameters


To select superior strains of the egg parasitoid Trichogramma chilonis Ishii, collections were made from cotton ecosystems of six different agroclimatic zones of the country viz., Anand (Gujarat), Ludhiana (Punjab), Coimbatore (Tamil Nadu), Bangalore (Karnataka), Rajahmundry (Andhra Pradesh) and Nagpur (Maharashtra). These ecotypes are referred as BioC1, BioC2, BioC3, BioC4, BioC5, and BioC6 respectively. Mean fecundity during F1, F20, and F40 generations in the laboratory was significantly more in BioC1, BioC2, and BioC6 than in others. Longevity of males was 4.0, 4.0 and 4.2 days and that of females was 7.0, 7.4 and 7.3 days respectively in BioC1, BioC2 and BioC6 strains, which was higher than in the other three ecotypes. Net reproductive rate (Ro) and rate of increase per female per generation (λ) was higher in BioC1 and BioC2. There was no difference in emergence pattern and sex-ratio amongst six ecotypes. Results thus, indicated that BioC1 and BioC2 are superior to other ecotypes.


Trichogramma chilonis, Superior Strains, Selection.

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