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Among non-mulberry silks, only eri silk production is in increasing trend and India stands second in eri silk production. Eri silkworm, Samia ricini is domesticated and polyphagous in nature. In India most of the sericulture belt prevails in the tropical region where temperature goes 32–40 °C during the summer when compared to interior parts. Eri silkworm is poikilothermic insect, temperature will have direct effect on physiological growth and development of the silk gland. The silk gland accumulates proteins during the silkworm development and its growth is importance for the synthesis of silk proteins. The temperature required for eri silkworm is 24-28 oC and above this temperature is harmful to the growth and development of silkworm. Insects have adopted different biological and physiological strategies to overcome changes in their surrounding environment but lack of tolerance in domesticated eri silkworm may affect growth and development of silk gland and eventually silk production. Therefore, the present study was conducted under thermal stress condition (31.2 ± 1°C) to assess some important physiological parameters such as larval weight (g), silk gland weight (g),silk gland somatic index (%) and silk conversion index (%) of different ecoraces Viz. Borduar, Titabar and Mendipathar. The results show that Mendipathar eco race performed better than Borduar and Titabar ecoraces in all the parameter studied.

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