National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The goal of this experiment was to study the life history and population growth parameters of Cricula trifenestrata Helfer (Lepidoptera: Saturniidae) reared on Machilus bombycina King, the food plant of muga silkworm (Antheraea assama Westwood). Biological and life table parameters differed significantly in different generations. The longest and shortest larval period of 43.68±1.34 and 38.67±1.13 days were recorded in January-March and May-October generations respectively. The development time of total pre adult was shortest in March-May (77.12±1.73 and 78.42±1.60 days for male and female) generation. The egg to adult survivorship and fecundity were highest in October-January generation (49.00±1.45% and 122.35±3.02). The sex ratio was male-biased. The highest intrinsic rate of increase (rm), finite rate of increase (λ) and the shortest mean generation (GT) and doubling time (Td) were recorded during January-March. The lowest intrinsic rate of increase (rm), finite rate of increase (λ) and the longest mean generation time (GT) and doubling time (Td) were recorded during May-October. The highest and lowest net reproductive rate (Ro) and potential fecundity occurred in female of October-January and March-May generation respectively. The results revealed that May-October was the most unsuitable month for population growth of C. trifenestrata. So, control measure if be taken for the pest during May to October, then the percent of damage caused by the caterpillar can be minimized, that might improve the performance of Antheraea assama during commercial rearing seasons in terai region of West Bengal.
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