Sashindran Nair K.,National Silkworm Seed Organization
Indian Silk | Year: 2011
A technology developed with certain objectives and targets meets success but retaining its acceptance and popularity depends on various factors including awareness about the product, sustained development as well as inclination and proactive approach of the stakeholders. An attempt is made here to explain how things might have gone awry with regard to acceptance of Sampooma, once a darling of the sericulturists, scientists and the promoters, and suggests the remedial course.
Nair J.S.,Silkworm Seed Technology Laboratory |
Kumar S.N.,Central Sericultural Research and Training Institute |
Nair K.S.,National Silkworm Seed Organization
Journal of Biological Sciences | Year: 2011
As component bivoltine pure strains of existing productive silkworm hybrids did not accept the artificial diet, the study was taken up to create a pool of such strains which would feed on the artificial diet. Six strains viz., 5HT, GEN4, 8HT, B71, CSR3 and JPN8 were short-listed based on the results of an initial screening which recorded feeding response percentage of more than 20. These six strains were further subjected to continuous inbreeding and directional selection for 12 generations for improving the feeding response over the generations and stabilizing it at more than 85% so that they would form suitable breeding resource materials for preparation of commercial bivoltine hybrids for exclusively rearing on artificial diet during young instar. Care was taken so that breed characters in terms of economic traits were not adversely affected. At the end of ninth generation, the feeding response reached above 78% except in B71 and further stabilized at the higher level and thus forming prospective parents for bivoltine hybrid combinations. Data pertaining to G9-G12 were analyzed to check the stability in performance. The traits with particular reference to the diet phase such as feeding response, young instar larval duration and young instar larval weight have reflected non-significant differences in the last four generations clearly indicating the stability in these traits. Other traits such as cocoon weight, cocoon shell weight, shell percentage, survival and cocoon yield also did not vaiy among the generations. After the strains were stabilized for rearing on artificial diet, they were designated as 5HT (A), GEN4 (A), 8HT (A), B71 (A), CSR3 (A) and JPN8 (A) as these strains are different from the normal strains (5HT, GEN4, 8HT, B71, CSR3 and JPN8). The implications of the improved feeding response and stabilized economic traits in the context of this study are discussed. 2011 Asian Network for Scientific Information. © 2011 Asian Network for Scientific Information.
Sashindran Nair K.,National Silkworm Seed Organization |
Nair J.S.,Silkworm Seed Technology Laboratory |
Vijayan V.A.,University of Mysore
Journal of Biopesticides | Year: 2010
Juvenile hormone (JH) analogues and mimics regardless of synthetic or of plant/animal origin are potent pest control agents and are popularly referred to as 'third generation pest control agents'. ω-formyl longifolene oxime propargyl ether (NL13), an oxime ether of carbonyl compounds derived from longifolene, a tricyclin sesquiterpene from Indian turpentine oil extracted from the chir pine, Pinus longifolia (Roxb., Pinaceae) and bakuchiol, isolated from the medicinal weed, Psoralea coryllifolia (Linnaues) (Papilionaceae) are proven biopesticides against Culex quinquefasciatus and Dysdercus Koenigi, respectively. These two compounds show JH mimicking activities and disrupt the regular developmental pattern and thus identified as potential biopesticides. Since the larvae of silkworm Bombyx mori L. are known to respond positively to administration of exogenous JH analogues and mimics in terms of enhanced silk production, minute quantities of these two compounds were administered to fifth instar larvae based on the results of previous broad spectrum dose response studies. Emulsions containing 2.5, 5 and 10 ppm of NL13 and 0.625, 1.25 and 2.5 ppm of bakuchiol were administered to the fifth instar larvae of bivoltine silkworm hybrid, KA × NB4D2 at 24, 48, 72 and 96 h at the rate of 12.5 ml/100 larvae, 30 minutes prior to feeding at about 10 am. The compounds elicited notable positive response in silkworm in terms of improved economic traits such as larval and cocoon characters. In the case of NL13, 5 ppm and in the case of bakuchiol, 1.25 ppm of the compounds at 48 h of 5th instar showed the maximum improvement in the cocoon traits in the range of 10~15%. The physiological impact of the compounds on silkworm growth and development and the resultant impact on the commercial traits are discussed. © JBiopest.
Sandhya C.R.,National Silkworm Seed Organization |
Srinivasa G.,National Silkworm Seed Organization |
Rahmathulla V.K.,Basic Seed Farm |
Rajan R.K.,Central Muga Eri Research Institute
Journal of the Textile Association | Year: 2010
The accumulation of savings and later on conversion in to capital formation is one of the critical and important factors for the development of any industry. Sericulture as a biological industry is contributing a lot to farmer's income levels in the rural areas. The sericulture enterprise is proved to be the major income and savings contributing enterprise for the farmers. There is limited information available on the conversion of these income and savings in to capital in sericulture. Hence, the present investigation was carried out to understand the level of capital formation in sericulture and the factors responsible there of. For the purpose, primary data were collected from 90 randomly selected sericulturists in Mandya district of Karnataka spread over three taluks. Structured schedules were prepared to collect data through personal interview method. The results indicated that the factors like area under mulberry in small and medium farmers category, technology adoption and cocoon yield in case of small and large farmers category and labour employed in medium farmers category were found to be influencing capital formation positively and significantly. The study concludes by saying that the sustainability of sericulture enterprise could be achieved in the study area by strong market linked credit policy.
Rahmathulla V.K.,P3 Basic Seed Farm |
Kishor Kumar C.M.,P3 Basic Seed Farm |
Angadi B.S.,National Silkworm Seed Organization |
Sivaprasad V.,National Silkworm Seed Organization
Journal of Entomology | Year: 2012
Change in climate involving temperature variation influences the incidence of microsporidiosis in silkworm. As microsporidian disease in silkworm is epidemic, transovarially transmitted to progeny eggs and prevention of the disease is very vital in parental silkworm seed multiplication. The impact of different climatic conditions viz., summer, rainy and winter on the incidence of microsporidian disease in silkworm was studied at a sericulture Basic Seed Farm, at Mysore, Karnataka, India as a part of the regular monitoring and control of the disease carried out for a period 3 years (2008-10). The results indicated that the disease incidence was higher during the beginning of winter season (October-November) followed by rainy season (July-September) and the incidence was least in summer season (March-May). Correlation analysis showed that the incidence was correlated positively with humidity and negatively with temperature recorded from the study location. © 2012 Academic Journals Inc.