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Silkworm Diseases and Pests

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Industrial Entomology

Abstract

Silkworm, Bombyx mori L is susceptible to mainly four diseases namely; Grasserie, Flacherie, Muscardine and Pebrine. The average silkworm crop loss in India due to diseases is to the tune of 15–47%, while it is 10–15% in other countries like Japan, China and Italy. Out of four diseases, Flacherie (33.88%) is the major killer in India. The incidence of silkworm diseases is more during autumn season (35–47%) than spring (15–20%) in North West India. Generally, bivoltine silkworms are more susceptible to diseases as compared to multivoltine silkworm breed. The important factors responcible for the high disease incidence during autumn season are higher pathgen load, wider fluctuation of temperature between day and night, higher humidity in the late stage of rearing and poor quality of mulberry leaves available for rearing in North West Indian condition. The most popular methods of disease control in silkworm cocoon crop are prophylactic by controlling pathogens in rearing rooms and preventing pathgen entry during rearing. There is no race of B. mori, totally resistant or immune to diseases and pests. Hence, proper disinfection is required to kill all the pathgens present in the rearing environment and to eliminate risk of disease transmission. Proper, effective and strict disinfection of rearing house, its surroundings, appliances and hygienic measures are most crucial as policy of “Prevention is better than cure” is best in silkworm rearing. The chapter deals with pathogen and pathogenesis of silkworm alonf with their prevention and control measures

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Acknowledgements

The authors are thankful to the Central Silk Board, Bangalore, India, for getting an opportunity to learn and understand the core issues related to sericulture industry in general and Indian Sericulture in particular, which has helped us in writing this manuscript.

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Correspondence to Mukesh K. Tayal .

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Tayal, M.K., Chauhan, T.P.S. (2017). Silkworm Diseases and Pests. In: Omkar (eds) Industrial Entomology. Springer, Singapore. https://doi.org/10.1007/978-981-10-3304-9_9

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