夏秋蚕新品种芳草×晨·星的育成

THE REPORT OF THE NEWLY IMPROVED SILKWORM RACE FANGCAO×CHEN.XING FOR SUMMER-AUTUMN REARING

芳草×晨·星是在“七五”期间纯种选育基础上，“八五”期间通过杂交组合选配选拔出来的夏秋用三元杂交种。省级实验室鉴定结果，与对照种薪杭×科明相比，万蚕产茧量高5.43％，万蚕茧层量高5．08％，解舒丝长长11.79％，茧丝长长7.35％，净度92分以上，纤度2.78dtex，出丝率与对照种相仿。农村生产鉴定结果，其成绩和经济指标优于对照或与之相仿，符合浙江省蚕品种审定标准，经省农作物品种审定委员会审定通过，已在生产上试繁推广。

Fangcao×Chen. Xing is a three way hybrid (C×J. J)for summer and autumn rearing,whlch was selected through cross combination. By the laboratory identification on provincial level,the cocoon crop per 10, 000 4th instar larvae is 5.43 % higher,the cocoon shell weight per 10,000 4th instar larvae 5. 08% higher, the length of cocoon filament 7.35 % longer and the non-broken cocoon filament 11.39% longer than those of the control race, Xinhang×Keming. its neatness is more than 92 marks, cocoon filament size 2.78 dtex and raw silk rate is similar to the control race. The identification on production level showed that its economical characters are superior or similar to the control race. The results conformed to the provincial standard for silkworm variety identification in Zhejiang Province. It has been authorized by the Provincial Variety Identification Committee for commercial production.