Bioefficacy of some plant extracts against pathogenic bacteria isolated from diseased silkworm larvae

Content Provider	Semantic Scholar
Author	Mohanta, Moni Krishna Saha, Ajay Krishna Saleh, D. K. M. A. Hasan, Ali
Copyright Year	2018
Abstract	During the time of rearing, the larvae of the silkworm, Bombyx mori come in contact with pathogenic bacteria which accounts for considerable loss to cocoon production. In this connection, the bacterial pathogens were isolated from diseased silkworm larvae by growing them in a nutrient agar medium, and bio-efficacy of plant extracts against pathogenic bacteria was the main focus of the study. Morpho-physiological characteristics, biochemical properties and DNA sequencing of the 16S rRNA gene indicated that the pathogenic bacterium was Klebsiella pneumoniae. Growth of bacterium was observed in the presence of the extracts of Cinnamomum zeylenicum, Azadirachta indica, Curcuma longa and Zingiber officinale using the disc diffusion method. It was found that bioefficacy of the ethanol extracts of C. zeylenicum (22mm zone diameter of inhibition), C. longa (21mm zone diameter of inhibition), Z. officinale (20mm zone diameter of inhibition) and A. indica (10mm zone diameter of inhibition) showed against K. pneumoniae respectively. The test plant extracts can be used as the source of antibiotic substances for possible controlling of K. pneumoniae causing flacherie disease of silkworm larvae.
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Language	English
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Content Type	Text
Resource Type	Article