Effect of Microsporidian Infection on Reproductive Potentiality on Mulberry Silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) in Different Seasons
2008
Chakrabarti, Satadal (University of Calcutta, Kolkata, India), E-mail: [email protected] | Manna, Buddhadeb (University of Calcutta, Kolkata, India)
Infection of pathogenic microsporidia, Nosema bombycis and Nosema mylitta (Chakrabarti and Manna, 2006) decreased egg production, fecundity, hatching % and increased sterile eggs in heavily infected mulberry silkmoth, Bombyx mori L. On an average a disease free moth laid upto 442.67 eggs with high hatching % (99.53) and less sterile eggs (0.47~2.00%). While an infected moth laid less number of eggs (7.00~412.00) with low hatching % (32.437~98.643) and high sterile eggs (2.143~129.571). Fecundity of disease free laying was highest (468.714) during season-1 then gradually decreased during season- 2 (414.000) to season- 3 (404.285). But fecundity of an infected laying was highest during season-2 and hatched eggs were lowest during season-2. Higher inoculums concentration of N. mylitta infected to 5∨th stage larva of mulberry silkworm drastically decreased the fecundity in season - 3 and lower inoculums concentration of N. bombycis decreased the fecundity in season-1 and 3. Season-3 was most effective season to decrease the fecundity and increase sterile eggs when both temperature and humidity were fluctuated from the optimum level.
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