ACKNOWLEDGEMENTS
The authors are gratefully acknowledged the help and support rendered by Director, Institute of Bioresources and Sustainable Development (IBSD), Manipur, Dept. of Pathology, RIMS and Regional Sericultural Research Station, Imphal for the conduct of this study. While the first author acknowledges Institute of Bioresources and Sustainable Development, Manipur India for financial assistance through IBSD-Ph.D. programme.
Conflict of interest: The authors have no conflict of interest to declare.