Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 04, Issue 1, 2002; Page No.(87-92)

BACTERICIDAL ACTIVITY OF SOME PLANT EXTRACTS ON THE GROWTH OF FLACHERIE CAUSING BACTERIA IN THE SILKWORM BOMBYX MORI

T. THANGARAJ, M. SRINANDHINIDEVI AND M. ARUCHAMI

Abstract

Silkworm rearing free from diseases is a major constraint in sericulture industry. About 34-40% of the total crop in a year has been reported to be loss due to diseases because of the occurrence of four major diseases namely Pebrine (Protozoan disease) Flacherie (Bacterial and viral disease) Grassserie (viral disease) and Muscardine (fungal disease) (Vaidya, 1960). Flacherie is known to be caused by the assembly of various pathogenic bacteria in silkworms and are commonly referred as bacterial flacherie. Bacterial species were isolated from different tissues such as fat body, digestive system, haemolymph and cuticle of the infected silkworm and are staphylococcus, Serratia, Escherschia species. Growth of the bacterial species were observed in the presence of various plant extracts. Minimal inhibitory concentrations of the plant extracts have been determined and its application towards control of the flacherie casing bacterial species has been assessed.

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