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Reduction in food consum tion, weight loss during exposure period and reduction in growth rate occurs, when third and figh instar larvae of Pericallia rin'ni Fabr. were fed on castor (Ricinws communis) leaves dipped in different concentrations of diamino-furyl-s-triazine. Maximum reduction in total food consumption noted was 63.40 % at 0.01 % level in third instar larval feeding treatment.During the exposure period, larvae lost their weight (maximum by 36.46% in third instar larvae). Maximum reduction in larval growth was also recorded in third instar larvae, which was 63.08 % at 0.01 YO. With the increase of concentration, the reduction in food consumption and growth rate was increased considerably. The chemical was more active on third instar than fifth instar larvae. Larval duration of treated individual was also increased. But'the larval duration of treated larvae was increased only in the instar in which it was treated.

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