The experiment was conducted during 2012 to 2014 at the Department of Sericulture, University of Agricultural Sciences, GKVK, Bangalore to evaluate the castor cultivars suitable for eri chawki silkworm rearing and its subsequent performance. Eri silkworm(Samia Cynthia ricini Boisduval) is a non-mulberry domesticated silkworm belongs to the family Saturnidae of the order Lepidoptera.  Eri silk is produced by Samiacynthiaricini). Eri silkworm is a polyphagous insect and castor is the preferred host for its rearing. Eri silkworm, Samia cynthia ricini Boisduval was reared using eight castor cultivars viz., DCH-519, 48-1, DCS-9, GCH-4, DCH-177, GAUCH-1, JC-12 and Bangalore local. The eri silkworms fed on leaves of GAUCH^-1 cultivar showed marked variation with respect to larval weight and larval duration of chawki worms. The least total larval duration (21.67days) was noticed in larvae fed with leaves of GAUCH^-1. Further, cocoon weight, shell weight, pupal weight, effective rate of rearing (ERR) and silk productivity were also superior in the batches of silkworms fed on leaves of GAUCH^-1 cultivar.