Taking introduced trimolter varieties 853 Bai and 543 B with stable moltinism as male parents,and tetramolter varieties 932,7532,Furong,Xianghui with excellent comprehensive economic characters in current production as female parents,the trimolter varieties San,Long,Hui and Yuan with excellent comprehensive economic characters and stable moltinism were bred using cross breeding and systematic breeding methods,and healthy trimolter four-way cross combination " San·Long × Hui·Yuan"( Yuecanxixian No. 1) was assembled. Provincial laboratory and rural production and identification results showed that the variety had strong vitality,stable moltinism( trimolt rate over 98%) and short duration; laboratory identification results were as follows: cocoon filament size 1. 853 dtex,cocoon filament length 1 146 m,reelability percentage 73. 04%,neatness 95. 38 points,strength 4. 63 m N / dtex,elongation rate 23. 3%,cohesion 116 times. The variety was approved by Guangdong Crop Variety Approval Committee in December 2010,which can be used as raw cocoon for reeling high-grade fine size raw silk.
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