Erisilkworm (Philosamia ricini) Rearing&Comparative Analysis of its Economic Parameters Based on Different Food Plants in Deosal village, Mayong Block, Morigaon District, Assam, India

North-East India is famous for natural silk like Eri, Muga, Mulberry& Tasar. This region provides favorable conditions to these valuable silk insects. Eri silkworm is one of the domesticated silkworm races under self rearing in Assam. The present study was carried out at Deosal village, Mayong Block, Morigaon District, Assam, India during 2016-17. Geographically it is situated at 26?07'40.8'' N Latitude, 092?15'08.6'' E Longitude& altitude of 62 m (MSL). The observation was recorded through primary data on participatory profiles in host plant cultivation& management, rearing of silkworms, spinning of spun yarn, etc were collected randomly from 10 household actively associated in erisilkworm rearing through personal contact method using pre-structured interview schedule. The specimen of egg, larvae, cocoon& moths are collected for morphological characterization. We have found that highest larval length in mature larvae is 9 cm& weight is 8.940 gm (Ricinus communis Linn& Heteropanax fragrans fed). Pupal weight is found to be highest in 3.2 gm in Heteropanax fragrans Roxb& Alpinia allughos fed larvae. Cocoon is of two colours- white& brick red. Shell ratio (%) is highest in Castor fed larvae i. e 21.05%. the families involved in ericulture in Deosal area belong to lower section of the society in terms of both income& education. Castor (Ricinus communis) is found to be one of the constraints in eri silkworm rearing among the rearers.