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Rao, D.Raghavendra,Singh, Ravindra,Kariappa, B.K.,Dandin, S.B. Korean Society of Sericultural Science 2004 International Journal of Industrial Entomology Vol.9 No.2
Variation in the size of the silk filament will determine the uniformity and quality of the silk reeled. In the present study, an attempt has been made to study the filament size variation in 6 multivoltine parental breeds and 9 multivoltine ${\times}$ bivoltine hybrids in all three seasons of a year. All multivoltine breeds and multivoltine ${\times}$ bivoltine hybrids showed variation in filament size throughout its length from the outer layer to inner layer. Results of the present study indicated that the size of the filament decreased from outer to inner layer. The decrease in filament size was sudden in some breeds/hybrids whereas it was gradual in other. Relationship between filament length to that of slope, average filament size to slope, and maximum filament size to slope was determined based on regression analysis. Regression analysis revealed significant positive correlation between slope vs average filament length (r=0.92$^{**}$) in multivoltine${\times}$bivoltine hybrids. Among parental breeds, 96C showed lowest slope of the curve (b-value: -0.00428) and 96A showed highest slope of the curve (b-value: -0.00269). Among 9 hybrids, PM${\times}$N $B_4$ $D_2$ recorded lowest slope value (b-value: -0.00328) and BL24${\times}$N $B_4$ $D_2$ showed highest value for slope of the curve (b-value: -0.00234). The breed 96C, which showed lowest slope value can be utilized for future breeding programmes to breed strains with less size deviation. Three multivoltine${\times}$bivoltine hybrids viz., PM${\times}$N $B_4$ $D_2$, 96E${\times}$CSR19 and BL67${\times}$CS $R_{101}$ , which showed less slope values (b-values: -0.00328, -0.00300 and -0.00297 respectively) can be utilized for commercial exploitation to produce uniform silk.k.
Kariappa, B.K.,Kumar, Vineet Korean Society of Sericultural Science 2002 International Journal of Industrial Entomology Vol.5 No.1
Lepidoscelio viatrix is a potential biocontrol agent of the eggs of wingless grasshopper, Neorthacris acuticeps nilgerensis, in mulberry plantation in natural conditions. The present investigation was undertaken to understand the attachment of the parasite to the hopper under scanning electron microscope and the oviposition behavior of the parasite. The results reveal that the parasite grips firmly to the lateral and dorsal surfaces of the female grasshopper with its mandibles implanted in the intersegmental membranes of the abdominal segments. During oviposition, L. viatrix initially turn around the egg pod and protrude its ovipositor and insert into the eggs. It lays eggs inside the eggs of grasshopper by an up and down movement of the ovipositor, Further, field observations indicated a drastic fall in the incidence of the grasshopper population on mulberry, with the increased parasitization of L. viatrix.
Development of a Robust Polyvoltine Breed $'NP_1'$ of the Mulberry Silkworm, Bombyx mori L.
Singh Ravindra,Rao D. Raghavendra,Sharma S.D.,Chandrashekaran K.,Basavaraja H.K.,Kariappa B.K.,Dandin S.B. Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.12 No.1
A breeding programme was initiated during 2001 utilizing two polyvoltine silkworm breeds viz. $BL_{69}$, an evolved breed tolerant to high temperature and MAR, comparatively resistant to Bombyx mori nuclear polyhedrosis virus (BmNPV) with the objective to develop robust polyvoltine breeds and hybrids. The breed $NP_1$ was developed by exposing the fifth instar larvae to high temperature $(36{\pm}1^{\circ}C)$, high Relative Humidity ($85{\pm}5%$ R.H.) and inoculating third instar larvae with BmNPV inoculum. At $F_{12}$, the breed was tested for hybrid forming ability utilizing six bivoltine silkworm breeds viz. $CSR_2,\;CSR_4,\;CSR_{17},\;CSR_{18},\;CSR_{19}\;and\;NB_4D_2$. The hybrid $'NP_1{\times}CSR_{17}'$ exhibited its superiority by recording 97.2% survival, 1.892 g cocoon weight, 0.406 g cocoon shell weight, 21.5% cocoon shell ratio, 16.6% raw silk percentage and 890 m filament length whereas the control $(PM{\times}CSR_2)$ has recorded 90.2% survival, 1.599 g cocoon weight, 0.304 g cocoon shell weight, 18.9% cocoon shell ratio, 13.1 % raw silk percentage and 768 m filament length. Commercial exploitation of the new $polyvoltine{\times}bivoltine$ hybrid in sericulture industry has been discussed.
Kumar, Vineet,Kariappa, B.K.,Chaturvedi, H.K.,Sarkar, A.,Datta, R.K. Korean Society of Sericultural Science 2000 International Journal of Industrial Entomology Vol.1 No.1
A comprehensive study on daily pupal weight loss due to histolysis and histgenesis in Bombyx mori Linn., has been undertaken. The percentag of pupal weight loss in the male pupa is higher than the female, conforming that the female pupa require more energy in the form of less pupal weight loss for ovipositional activities. The regression equation clearly shows higher percentage loss of daily pupal weight in male than female with respect to age and, this is also evident from the slope of the regression line. Moreover, analysis of the coefficient of correlation shows that the weight loss of pupa is directly correlated with the age rather than climatic parameters under which the pupa dwells.
Stimulation of Fecundity through Antennal Amputation in the Mulberry Silkworm, Bombyx mori L.
Ravindra Singh,Virendra Kumar,B. K. Kariappa,S. B. Dandin,D. Raghavendra Rao 한국잠사학회 2004 International Journal of Industrial Entomology Vol.8 No.2
Stimulation of fecundity following female antennal amputation has been reported for the first time in silkworm. Antennal amputation caused significant increase in fecundity in two newly evolved multivoltine silkworm breeds viz., BL 67 and 96A. This study indicated better chances for increasing egg yield and the increase in fecundity may be attributed to the action of some neurohormones. Significance of antennal amputation in silkworm has been discussed.
Stimulation of Fecundity through Antennal Amputation in the Mulberry Silkworm, Bombyx mori L.
Singh, Ravindra,Kumar, Virendra,Kariappa, B.K.,Dandin, S.B.,Rao, D.Raghavendra Korean Society of Sericultural Science 2004 International Journal of Industrial Entomology Vol.8 No.2
Stimulation of fecundity following female antennal amputation has been reported for the first time in silkworm. Antennal amputation caused significant increase in fecundity in two newly evolved multivoltine silkworm breeds viz., BL 67 and 96A. This study indicated better chances for increasing egg yield and the increase in fecundity may be attributed to the action of some neurohormones. Significance of antennal amputation in silkworm has been discussed.