• Journal of Sericultural and Entomological Science
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• v.50 no.2
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• pp.101-108
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• 2012

This study was conducted to confirm the mass production of male pupae and sex-limited larval marking variety as a host for synnemata production of Isaria tenupes in RDA(Rural Development Administration). Silkworm pupation, infection rate and synnemate formation of I.tenuipes were examined. Among the silkworm varieties tested, male Hansaengjam showed the highest pupation rate at 98.7%. I. tenuipes infection rate of larvae of newly-exuviated 5th instar silkworm was 83.7 ~ 90.4% in the spring rearing season and 91.7 ~ 96.6% in the autumn rearing season. Synnemata production of I. tenuipes was execellent in female Yangwonjam with an incidence rate of 99.5% followed by male Yangwonjam(99.5%) and Baegokjam(99.4%) in the spring and autumn rearing season. Synnemata living weight ranged from 0.93 ~ 1.25 g in the spring rearing season. The female Hansaengjam had the heaviest synnemata weight(1.25 g). Synnemata dry weight ranged from 0.27 ~ 0.35 g in the spring rearing season. The female Yangwonjam had the heaviest synnemata weight(0.35 g).

• Journal of Sericultural and Entomological Science
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• v.46 no.2
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• pp.54-57
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• 2004

A new silkworm variety "Buhungjam" for autumn rearing season is $F_1$ hybrid between Jam149, a japanese race bred from introduction breeding and Jam150, a chinese race from introduction breeding. Jam149, japanese parent of the "Buhungjam" showed high GCA in pupation percentage, cocoon shell percentage and filament length and Jam15, chinese parent showed high GCA in cocoon shell percentage and cocoon filament length. In the local adaptability test performed at 8 local areas in spring of 2003, Buhungjam records 7% higher in cocoon yield and 8% in raw silk yield than the check variety, Daesungjam.