ABSTRACT In the present investigation BmNPV infection and subsequent oral treatment of ethanolic plant extracts effect was studied. After the inoculation and oral treatment of plant extractives observed the cocoon and post cocoon characters in both PM and CSR2 race. BmNPV inoculated group showed decreased the cocoon weight, shell weight, shell ratio, floss weight, filament length, filament weight and denier in both races. The maximum decrease was observed in CSR2 as compared to PM race. The significantly increased denier was observed in PM race treated with B. spectabilis as compared to control group i.e. 3.9 ± 0.09 and 2.9 ± 0.6 respectively. In other treated group C. longa and A. mexicana shows increase in all cocoon and post cocoon characters but not significant increase was observed as compared to their respective control group. Key Words: BmNPV, C. longa, A. mexicana, B. spectabilis REFERENCES [1.] Ahmad, I. and Beg, A. Z. 2001. 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