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以具有限性斑纹但经济性状较差的C3 1、J3 1和现行体质强、茧丝优的芙蓉、湘晖为亲本 ,采用杂交和回交的方法 ,经多代选择 ,育成了具有斑纹限性的夏秋用蚕品种西蓉和夏D ;通过配合力测定 ,组配成三元杂交种秋·西*夏D.鉴定结果表明 ,该品种体质强健 ,产量与苏 3·秋 3*苏 4相仿 ,茧丝质性状优良 ,茧丝长 1 0 61M ,解舒丝长 72 7M ,净度 95 4 5分 ,综合经济性状优.“,”C31 and J31 both with sex limited marking but bad economic character,and practical varieties Furong and Xianghui both with excellent economic character,were used as breeding parents.Cross and back cross breeding methods were employed in this study.Two sex limited varieties named Xirong and Xia D were bred through selection and cultivation of many generations.By means of combining ability test,a three way hybrid combination with sex limited marking named “Qiu·Xi * Xia D” was selected.The identifications both of provincial and national showed that it is a strong and healthy variety with similar cocoon harvest to Su3·Qiu3*Su4,excellent silk quality and high comprehensive economic character.Its cocoon filament length is 1 061m,length of non broken cocoon filament 727m,neatness 95.45 points.