Effect of Microsporidian Infection on Reproductive Potentiality on Mulberry Silkworm, Bombyx mori L. (Lepidoptera Bombycidae) in Different Seasons = Effect of Microsporidian Infection on Reproductive Potentiality on Mulberry Silkworm, Bombyx mori L. (Lepidoptera Bombycidae) in Different Seasons

다국어 초록 (Multilingual Abstract)

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 5th 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.