Investigation on the rate of spread of Grasserie disease in Silkworm, Bombyx mori L population

Grasserie is most dreaded disease among all infectious diseases of the silkworm, B. mori which cause heavy crop loss at field level if not managed properly. In present study rate of disease spread in silkworm population through different modes (inoculation, spray and also through introduction of carriers in a healthy population of silkworms) were investigated that revealed the disease spread in the silkworm population through all the three modes and ascertained that once pathogen comes in contact with the host not only spread infection in the but also deteriorate the economic characters significantly. It is therefore, concluded that utmost care must be given to exclude the pathogen from the rearing environment in order to save the cocoon crop.