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Selvakumar T.,Nataraju B.,Chandrasekharan K.,Sharma S. D.,Balavenkatasubbaiah M.,Sudhakara Rao P.,Thiagarajan V.,Dandin S. B. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.11 No.1
While observing silkworm larval samples received from field, microsporidian spores formed within the haemocytes of silkworm haemolymph were observed. The spores of microsporidian sp. were purified and characterized for morphological characters viz., size, shape as well as serological affinity with different Nosema spp. (M$_{11}$ and M$_{12}$). The infectivity of the isolated spores to silkworm was also studied. The microsporidian sp. was found to be highly pathogenic to silkworm, B. mori. The isolated microsporidian sp. was designated as NIK-5hm, which formed ovocylindrical spore in the haemocytes of silkworm and differed in spore size (length, 4.55 $\mu$m & width, 2.10 $\mu$m) and shape from Nosema bombycis (NIK-ls), NIK-2r (Nosema sp. Mysore [3.6 & 2.8 $\mu$m]), NIK-3h (Nosema sp. M$_{11}$ [3.8 & 1.8 $\mu$m]), NIK-4m (Nosema sp. M$_{12}$ [5.0 & 2.1 $\mu$m]) and Lb$_{ms}$ (Nosema sp. in Lamerine breed of silkworm [4.36 & 2.14]). In immonological test (Latex agglutination test), the isolated microsporidian spores did not react with antibody sensitized latex particles of N. bombycis, M$_{11}$, M$_{12}$ and Lb$_{ms}$ and thus are different type of microsporidian sp., parasitic to silkworm, Bombyx mori L.
( T. Selvakumar ),( B. Nataraju ),( K. Chandrasekharan ),( S. D. Sharma ),( M. Balavenkatasubbaiah ),( P. Sudhakara Rao ),( V. Thiagarajan ),( S. B. Dandin ) 한국잠사학회 2005 International Journal of Industrial Entomology Vol.11 No.1
While observing silkworm larval samples received from field, microsporidian spores formed within the haemocytes of silkworm haemolymph were observed. The spores of microsporidian sp. were purified and characterized for morphological characters viz., size, shape as well as serological affinity with different Nosema spp. (M11 and M12). The infectivity of the isolated spores to silkworm was also studied. The microsporidian sp. was found to be highly pathogenic to silkworm, B. mori. The isolated microsporidian sp. was designated as NIK-5hm, which formed ovocylindrical spore in the haemocytes of silkworm and differed in spore size (length, 4.55 μm & width, 2.10 μm) and shape from Nosema bombycis (NIK-1s), NIK-2r (Nosema sp. Mysore [3.6 & 2.8 μm]), NIK-3h (Nosema sp. M11 [3.8 & 1.8 μm]), NIK-4m (Nosema sp. M12 [5.0 & 2.1 μm]) and Lb㎳ (Nosema sp. in Lamerine breed of silkworm [4.36 & 2.14]). In immonological test (Latex agglutination test), the isolated microsporidian spores did not react with antibody sensitized latex particles of N. bombycis, M11, M12 and Lb㎳ and thus are different type of microsporidian sp., parasitic to silkworm, Bombyx mori L.
Serichlor, A New Disinfectant in Indian Sericulture
Balavenkatasubbaiah M.,Nataraju B.,Sharma S.D.,Selvakumar T.,Chandrasekharan K.,Rao P. Sudhakara Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.12 No.1
Silkworm diseases are better prevented than cured. Disinfection and hygiene are the two important aspects in silkworm rearing to prevent the diseases. Suitable disinfectant is the primary need to disinfect the rearing house, its surroundings and appliances to eliminate the persistent pathogens from the rearing environment. In this direction, Serichlor, a new disinfectant in Indian Sericulture marketed as Serichlor-60 (contains 60,000 ppm of chlorine dioxide) and Serichlor-20 (contains 20,000 ppm of chlorine dioxide) has been evaluated for its germicidal effect against the pathogens of silkworm, viz., spores of Nosema bombycis, Bacillus thuringiensis, polyhedra of BmNPV and conidia of Beauveria bassiana both in vitro and in vivo. Results indicated that high concentration (2,500 ppm of chlorine dioxide) is required to kill all the pathogens at 100% level. The efficacy of the Serichlor was greatly enhanced by the addition of 0.5% slaked lime solution. 500 ppm of chlorine dioxide in 0.5% slaked lime solution was found effective against all the pathogens tested. This concentration of disinfectant was also found effective for disinfection of rearing house, rearing appliances and silkworm egg surface. The disinfectant is stable, non hazardous, least corrosive and most suitable for Indian Sericulture.