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以选育适合省力化饲养及原料茧品质优的家蚕新品种为目标,采用杂交育种和系统选育的方法,育成秋用强健性家蚕新品种E苏、9902B,并与选拔的优质多丝量品种Z83、Z84组配成四元杂交组合E苏·Z83×9902B·Z84,命名为鄂蚕6号.新品种在实验室品种比较鉴定和育种协作区共同鉴定以及农村生产试养试验中,均表现出强健好养、产茧量高、茧丝品质优的特点,秋季饲养综合成绩显著超过对照品种黄鹤×朝霞.实验室鉴定鄂蚕6号的虫蛹统一生命率94.93％,与对照品种相仿;茧层率23.46％,万蚕收茧量17.41 kg,茧丝长1 090m,鲜毛茧出丝率19.15％,分别比对照品种提高了3.26％、6.66％、8.28％、8.81％.新品种已于2015年通过湖北省农作物品种审定委员会审定,适合长江中下游蚕区秋季饲养.“,”In order to breed a new silkworm (Bombyx mori) variety that has high cocoon quality and is suitable for laborsaving rearing,cross breeding and pedigree selection was employed to breed two new silkworm varieties (i.e.Esu and 9902B) with strong vitality for autumn rearing,which were subsequently used to cross with two elected silkworm varieties (i.e.Z83 and Z84) with high yield and excellent quality of silk to prepare a four-way hybrid combination named Esu·Z83x9902B·Z84,designated as Ecan 6.The results of variety comparative evaluation in laboratory,co-evaluation in silkworm breeding cooperation division,and production test in farmhouse showed that Ecan 6 had excellent economic characters such as strong and healthy,easy-handling,high cocoon yield and excellent silk quality.The comprehensive performance of Ecan 6 from autumn rearing was remarkably superior to that of the contrast hybrid combination Huanghex Zhaoxia.Laboratory trial rearing revealed that the larva-pupa rate of Ecan 6 was 94.93％,being close to that of the control.Cocoon shell rate,cocoon weight per 10 000 larvae,cocoon filament length,and raw silk rate of fresh cocoons of the new variety were 23.46％,17.41 kg,1 090 m and 19.15％ respectively,being 3.26％,6.66％,8.28％ and 8.81％higher than that of the control respectively.This new silkworm variety has been approved by the Agricultural Crop Variety Evaluation Committee of Hubei Province in 2015.It is suitable for autumn rearing in the middle and lower reaches of the Yangtze River.