SEASONAL VARIATION OF THE REARING PERFORMANCE OF ERI SILK WORM, SAMIA RICINI (DONOVAN) ON KESSERU, HETEROPANAX FRAGRANS (ROXB.) SEEM
Journal Title: PARIPEX-Indian Journal of Research - Year 2017, Vol 6, Issue 9
Abstract
Eri silk, Samia ricini (Donovan) is the most popular domesticated silkworm among Vanya silks. It is multivoltine and polyphagous in nature feeding on a number of host plants namely Castor, Ricinus communis Linn; Kesseru, Heteropanax fragrans (Roxb.) Seem; Tapioca, Manihot esculanta Crantz; Payam, Evodia flaxinifolia Hook; Borpat, Ailanthus grandis Prain; Borkesseru, Ailanthus excelsa Roxb; Gulancha, Plumeria acutifolia (Poir); and several others (Sarmah, 2004). Among them castor and kesseru is considered as major food plant. It is observed that in the rearers' field condition, performance of eri silkworm rearing using kesseru foliage is not uniform in all the seasons. Hence, an experiment was undertaken to study rearing performance in different seasons. It was observed that autumn season was best in respect of rearing performance followed by spring season. Further, during scarcity of castor leaves during winter season kesseru is considered as suitable food plant for eri silkworm rearing. The rearing performance was compared with castor in all the season and it was observed that ERR% was above 81% in all the seasons and for all the treatment groups. Other two commercial parameters, which are shell weight and shell ratio also, did not differ much amongst the treatment groups. The mean shell weight and shell ratio were 0.38, 0.38, 0.43 and 12.50%, 13%, 13.54% in winter, summer and autumn respectively. Therefore, considering the commercially important parameters it may be concluded that the kesseru can be utilised effectively for eri silkworm rearing during scarcity of castor leaves
Authors and Affiliations
Dhiramani Bhuyan, Dr. M. C. Sarmah, Prof. K. Dutta
Keywords
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