Abstract: The present studies on the performance of P1 bivoltine seed rearing of four different silkworm races on some of the economic traits by feeding S-1635 variety of mulberry showed that in absence of extension supervision support due to outbreak of Covid-19 pandemic outbreak to the Adopted Seed Rearers (ASRs) have harvested good cocoon yield/100 dfls, pupation % was also attained above the norms set for procurement of seed cocoons etc., Further, highest single cocoon weight (g) and shell % was found in FC2 pure breed.