Abstract
The effects of different photoperiod on the weight of different larval Instars of Eri Silkworm (Philosamia ricini) in gram were studied. The experiments were performed in Zoology Department of Govt. P.G. M.V.M. Ujjain. The disease free laying (DFL’S) were collected from Govt. Sericulture Dept. Indore. Worms were reared under hygienic laboratory condition. The optimum temperature 25±2ºC and relative humidity 75±5% were maintained during complete experiment. The IInstar larvae attained maximum weightat 12hr. light and 12hr. dark. The II, III and IV Instars attained maximum weight in complete darkness and lowest weight in complete light.The V Instarlarvae attained maximum weight at 8hr. light and 16hr. dark.
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