International Journal of Industrial Entomology and Biomaterials

Korean Society of Sericultural Science (한국잠사학회)
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Seasonal Impact of Microsporidian Infection on the Reproductive Potential of Silkworm, Bombyx mori L. (Lepidoptera: Bombycidae)

  • Mohanan N. Madana (Central Sericultural Research and Training Institute, Central Silk Board) ;
  • Krishnan N. (Department of Physiology, Institute of Entomology, Czech Academy of Sciences) ;
  • Mitra P. (Central Sericultural Research and Training Institute, Central Silk Board) ;
  • Das N. K. (Central Sericultural Research and Training Institute, Central Silk Board) ;
  • Saratchandra B. (Central Silk Board, BTM Layout) ;
  • Haldar D. P. (Protozoology Laboratory Department of Zoology, University of Kalyani)
  • Published : 2005.12.01
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Abstract

Impact of microsporidian infection and season on reproductive potential of Bombyx mori L. was investigated in the laboratory. Microsporidian infection significantly (P<0.01) reduced fecundity and hatching and increased sterility and mortality of eggs. Among the microsporidia, Nosema sp. 2 infected silkworm produced eggs with least fecundity and hatching percent as well as highest dead and sterile eggs followed by Nosema sp. 1 and N. bombycis. Microsporidia, in general, significantly reduced fecundity and hatching percent of eggs and increased number of dead and sterile eggs in all the three seasons except N. bombycis in July - August (S3) and Nosema sp. 2 in January February (S1). Since, seed production is the anchor sheet of mulberry sericulture, coefficient of egg lying is considered as an important aspect and the industry quite often facing shortage of disease free layings. The present study indicates that B. mori is more susceptible to microsporidia during S2 followed by S3 and S1 and Nosema sp2. is most virulent followed by Nosema spl. and N. bombycis.

Keywords

References

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