The present disclosure relates to a composition for disinfecting silkworm rearing house, rearing appliances and rearing environment, said composition comprising a) 1, 3, Dibromo 5, 5, Dimethyl Hydantoin in an amount ranging between 85.0% and 95.0% with respect to the total mass of the composition and 1,4, Dichlorobenzene in an amount ranging between 5.0% and 15.0% with respect to the total mass of the composition, The present disclosure also relates to a method of applying said composition for disinfecting silkworm rearing house, rearing appliances and rearing environment.