Vol. 7, Issue 6 (2019)
Studies on mulberry silkworm cocoon traits due to Bm NPV infection
Author(s): DK Hadimani, MC Devaiah, KC Narayanaswamy, RN Bhaskar, Radha D Kale and KR Shreeramulu
Abstract: Silkworm diseases are caused by a number of pathogens that results in drastic reduction in the quantity and quality of cocoon crop. This ultimately has a direct effect on the farming community of the country due to reduced returns. Thus viral diseases of silkworm pose a serious problem in sericulture industry which need to be checked to the maximum possible level. Therefore, no serious attempts have been made systematically to screen different improved breeds and hybrids of mulberry silkworms for cocoon traits to BmNPV infection. In this direction, to screened the tolerance of BmNPV infection was under taken. The effective rate of rearing was significantly maximum in PM × CSR2 (62.50%), which was on par with that of MH1 × CSR2 (61.11%)). Similarly, the effective rate of rearing varied from 88.00 per cent in CSR2 × CSR4 to 93.00 per cent in PM × CSR2 of uninfected batches. Among the viral dilutions, the effective rate of rearing differed significantly in improved breeds and hybrids. The effective rate of rearing was significantly maximum in control batch (90.16%) followed by 10-6 PIBs (40.76%) and 10-3 PIBs concentration (37.04%).The cocoon, pupal and shell weights were found to be non-significant except shell ratio in improved breeds and hybrids of silkworm. The shell ratio was significantly maximum in CSR2 (22.64%). It was significantly minimum in PM × CSR2 (18.60%). Among the PIBs concentrations tested, the cocoon (1.30 g), shell (0.271g) and pupal weights (0.92 g) and shell ratio (20.64%) were significantly maximum at viral dilution of 10-6 PIBs followed by 10-3 PIBs (1.17g, 0.216g, 0.86g, 18.60 per cent, respectively) compared to the control (1.75g, 0.39g, 1.29g and 22.03 per cent, respectively).Among the interactions, the cocoon, shell and pupal weights and shell ratio were found to be non-significant.
Pages: 1079-1083 | 257 Views 40 Downloads
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How to cite this article:
DK Hadimani, MC Devaiah, KC Narayanaswamy, RN Bhaskar, Radha D Kale, KR Shreeramulu. Studies on mulberry silkworm cocoon traits due to Bm NPV infection. Int J Chem Stud 2019;7(6):1079-1083.
