Abstract
Phenology and cocoon characters of eri silkworm (Samia ricini Boisduvial) affected by temperature and humidity at Jorhat, Assam
Highlights
Effect of weather elements on phenophases and cocoon characters of eri silkworm Results presented in Table 1 revealed that occurrence of different phenophases and cocoon characters of eri silkworm were significantly affected by rearing seasons
Number of days taken to complete larval period was found to be significantly longest during early spring season (34.0 days) while it was shortest during summer (19.8 days) season
The highest cocoon weight (3.85 g) and cocoon shell weight (0.54 g) were recorded in early spring season followed by late spring (3.30 g, 0.40 g respectively), autumn (2.76 g and 0.36 g respectively) while the lowest values (2.06 g and 0.27 g respectively) were recorded in summer season
Summary
Phenology and cocoon characters of eri silkworm (Samia ricini Boisduvial) affected by temperature and humidity at Jorhat, Assam. It was reported that the temperature along with other climatic factors plays a crucial role in reproduction, development, fecundity and longevity of insects and poikilothermic animals (Duraimurugan, 2018) Silkworms being poikilothermic, their body temperature is directly controlled by the temperature outside and with an increase in temperature, the larval growth is accelerated and the larval period is shortened while at low temperature the growth is slowed down and the larval period is prolonged. The present investigation was designed to study the combined effect of temperature and RH on growth and cocoon yield of eri silkworm (Samia ricini Boisduvial) in different rearing seasons under the sub-tropical humid climatic conditions of Assam. Egg laying period, egg hatching duration, larval duration, larval weight and cocoon characters viz., cocoon spinning period, cocoon weight, cocoon shell weight, cocoon shell ratio were recorded.
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