The weight of 30 first-instar larvae was recorded before
inoculation, and the weight of larvae in every dish on the
fifth day was investigated. Then, the weight per larva was
calculated before inoculation and on the fifth day after
inoculation. Insect biomass accumulation was estimated
as: MRGR = (lnW2 – lnW1)/DD [42], where MRGR: mean
relative growth rate; W1: weight of per larva before
inoculation; W2: the weight per larva on the fifth day after
inoculation; DD: development days.