H. K. Jyothi ¹, G. Veeranna ¹, Geetha Bali ²

Affiliations
1 Karnataka State Sericulture Research and Development Institute, Thalaghattapura, Bangalore 560 062, Karnataka, IN
2 Bangalore University, Jnana Bharathi, Bangalore 560056, Karnataka, IN

Abstract

Biology of Dirhinus anthracia Walker was investigated on its natural host, Exorista bombycis Louis at six constant temperatures (10-35°C). The lower threshold for development for male and female was 10.5° and 11°C, respectively. Entire development from egg to adult required 475.05 and 550.96 day degrees, respectively for male and female. Sex ratio was in favour of female at all temperatures except 35°C where a reversal of sex ratio was observed. Reduction in doubling time and generation time was observed as temperature increased.

Keywords

Dirhinus anthracia, Exorista bombycis, Parasitoid, Temperature, Uzi Fly.

Full Text

   

H. K. Jyothi ¹, G. Veeranna ¹, Geetha Bali ²

Affiliations
1 Karnataka State Sericulture Research and Development Institute, Thalghattapura, Bangalore 560062, Karnataka, IN
2 Department of Zoology, Bangalore University, Bangalore 560 056, Karnataka, IN

Abstract

Possibility of low temperature storage of indigenous hymenopteran parasitoids of uzi fly (Exorista bombycis Louis) namely, Nesolynx thymus (Girault), Dirhinus anthracia Walker and Pachycrepoideus veerannai Narendran and AniI at various stages of life cycle, was investigated. Egg, larvae, pupae and adults of all the three parasitoids died when stored at 5 and 1 ODC. However, Dirhinus anthracia and Pachycrepoideus veerannai could be stored for 90 and 45 days, respectively at 15°C without hampering their reproductive potential. With increase in the duration of storage, a reduction in the adult parasitoid longevity and fecundity at ambient temperature was noticed.

Keywords

Dirhinus anthracia, Exorista bombycis, Nesolynx thymus, Pachycrepoideus veerannai, Storage, Uzi Fly.

Full Text