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Reddy, Rangareddygari Manohar,Suryanarayana, Nagabathula,Rai, Suresh,Sinha, Manoj Kumar,Hansda, Ganga,Ojha, Nand Gopal,Prasad, Bhagwan Chandra Korean Society of Sericultural Science 2010 International Journal of Industrial Entomology Vol.20 No.2
The bivoltine tropical tasar ecoraces of Antheraea mylitta Drury produces cocoons for seed production under seed crop rearing (July-August with $22{\sim}30^{\circ}C$ temperature and 50~70% relative humidity) and for silk production under commercial crop rearing (September-December with $17{\sim}27^{\circ}C$ temperature and 60~80% relative humidity). To consider the impact of hybrid vigour on egg, larva, cocoon and silk related commercial traits, the $F_1$ hybrids made among Daba, Jata and Raily ecoraces were assessed successively for three years. The hybrid vigour in the $F_1$ hybrid of Daba$\times$Jata ($T_7$) was positive for egg fertility (+23.1%), shell weight (+25.6%), silk yield (+79.0%) and filament length (+68.1%), with filament of high denier (11.98d) and reduced larval span (-7.1%). The Jata$\times$Daba ($T_8$) hybrid has shown negative heterosis in egg fertility (-8.0%) compared to the other F1 hybrids, Daba$\times$Raily ($T_9$) and Raily$\times$Daba ($T_{10}$), when they rise simultaneously during the commercial crop season. The better performance of parental ecoraces ($T_4$ to $T_6$) in their commercial traits during commercial crop over parents of seed crop ($T_1$ to $T_3$) and the superior performance of $F_1$ hybrids ($T_7$ to $T_{10}$) over parents of commercial crop ($T_4$ to $T_6$) during commercial crop season indicates the apparent hybrid vigour in tasar $F_1$ hybrids. As the Daba$\times$Jata ($T_7$) and Jata$\times$Daba ($T_8$) $F_1$ hybrids have shown highest hybrid vigour, their rearing during commercial crop can optimize the silk productivity and commercial sustenance of the tasar silk industry.
Singh, Gajendra Pal,Sahay, Alok,Kulshresth, Varun,Kumar, Phani Kiran,Pallavi, Saumya,Ojha, Nand Gopal,Prasad, Bhagwan Chandra Korean Society of Sericultural Science 2010 International Journal of Industrial Entomology Vol.20 No.1
Ten numbers of plants, based on their medicinal value, were used to test their efficacy against virosis (caused by cytoplassmic polyhedrosis virus) in tasar silkworm, Antheraea mylitta Drury. in indoor rearing conditions. The aqueous extracts of leaf of Azadirichita indica (neem), Acharanthus aspera, Psoralea corylifolia, Asparagus racemosus, Adhatoda zelanica (Basak), Andrographis paniculata (Kalmegh), Moringa oilephera (sahjan), whole plant of Phyllanthus urinaria (Bhuiamla), Centella asiatica (Veng sag) and Curcuma longa (Haldi powder) in different concentrations were used for containment of virosis in silkworm larvae. The tasar silkworm larvae were orally inoculated with PIBs ($1\times10^6$) of AmCPV in $2^{nd}$ instar and treated with plant extracts in each instar ($2^{rd}$ instar onwards). The mortality due to virosis was recorded during larval period. The plant extracts, irrespective of their concentrations, were found effective in suppressing the virosis where P. urinaria reduced the virosis to 56.90% followed by A. paniculata (53.82%) and least in C. asiatica (5.15%). The lowest pooled larva mortality 36.99% was recorded in the treatment of P. urinaria. Comparatively higher larva mortality 39.91% was observed with the treatment of A. paniculata. The highest larva mortality in treatment was with C. asiatica (81.99%). In treated control larva mortality was 86.50%.
( Rangareddygari Manohar Reddy ),( Nagabathula Suryanarayana ),( Suresh Rai ),( Manoj Kumar Sinha ),( Ganga Hansda ),( Nand Gopal Ojha ),( Bhagwan Chandra Prasad ) 한국잠사학회 2010 International Journal of Industrial Entomology Vol.20 No.2
The bivoltine tropical tasar ecoraces of Antheraea mylitta Drury produces cocoons for seed production under seed crop rearing (July-August with 22~30˚C temperature and 50~70% relative humidity) and for silk production under commercial crop rearing (September-December with 17~27˚C temperature and 60~80% relative humidity). To consider the impact of hybrid vigour on egg, larva, cocoon and silk related commercial traits, the F1 hybrids made among Daba, Jata and Raily ecoraces were assessed successively for three years. The hybrid vigour in the F1 hybrid of Daba×Jata (T7) was positive for egg fertility (+23.1%), shell weight (+25.6%), silk yield (+79.0%) and filament length (+68.1%), with filament of high denier (11.98d) and reduced larval span (-7.1%). The Jata×Daba (T8) hybrid has shown negative heterosis in egg fertility (-8.0%) compared to the other F1 hybrids, Daba×Raily (T9) and Raily×Daba (T10), when they rise simultaneously during the commercial crop season. The better performance of parental ecoraces (T4 to T6) in their commercial traits during commercial crop over parents of seed crop (T1 to T3) and the superior performance of F1 hybrids (T7 to T10) over parents of commercial crop (T4 to T6) during commercial crop season indicates the apparent hybrid vigour in tasar F1 hybrids. As the Daba×Jata (T7) and Jata×Daba (T8) F1 hybrids have shown highest hybrid vigour, their rearing during commercial crop can optimize the silk productivity and commercial sustenance of the tasar silk industry.
( Gajendra Pal Singh ),( Alok Sahay ),( Varun Kulshresth ),( Phani Kiran Kumar ),( Saumya Pallavi ),( Nand Gopal Ojha ),( Bhagwan Chandra Prasad ) 한국잠사학회 2010 International Journal of Industrial Entomology Vol.20 No.1
Ten numbers of plants, based on their medicinal value, were used to test their efficacy against virosis (caused by cytoplassmic polyhedrosis virus) in tasar silkworm, Antheraea mylitta Drury. in indoor rearing conditions. The aqueous extracts of leaf of Azadirichita indica (neem), Acharanthus aspera, Psoralea corylifolia, Asparagus racemosus, Adhatoda zelanica (Basak), Andrographis paniculata (Kalmegh), Moringa oilephera (sahjan), whole plant of Phyllanthus urinaria (Bhuiamla), Centella asiatica (Veng sag) and Curcuma longa (Haldi powder) in different concentrations were used for containment of virosis in silkworm larvae. The tasar silkworm larvae were orally inoculated with PIBs (1×106) of AmCPV in 2nd instar and treated with plant extracts in each instar (2rd instar onwards). The mortality due to virosis was recorded during larval period. The plant extracts, irrespective of their concentrations, were found effective in suppressing the virosis where P. urinaria reduced the virosis to 56.90% followed by A. paniculata (53.82%) and least in C. asiatica (5.15%). The lowest pooled larva mortality 36.99% was recorded in the treatment of P. urinaria. Comparatively higher larva mortality 39.91% was observed with the treatment of A. paniculata. The highest larva mortality in treatment was with C. asiatica (81.99%). In treated control larva mortality was 86.50%.