Studies were conducted on the growth, development and economic cocoon parameters of eri silkworm Samia cynthia ricini Boisduval on castor, fountain tree, banyan tree, Indian almond and carrot leaves during 2007-08. Results revealed that among the host plants tried for eri silkworm rearing, high survival rate (99.17%), growth index (4.444), matured larval weight (4.79 g), higher shell percentage (12.95%) and higher adult longevity of male and female (7.40 and 9.83 days) was obsered when reared on castor. The order of suitability of new hosts based on these parameters was fountain tree > banyan tree> Indian almond > carrot leaves.