天然黄色茧家蚕品种桂蚕H9选育研究

桂蚕H9是广西蚕业技术推广总站选配育成的强健性夏秋用特殊用途家蚕新品种。在省级实验室联合鉴定中，结茧率为97．29％，虫蛹率为95．99％，一茧丝长为849．51m，解舒率为74．09％，净度为91．84分。省级农村联合鉴定中，单张产茧量为31．47kg，一茧丝长为712．0m，解舒率为68．06％，净度为92．26分。与现行品种两广二号相比，结茧率、虫蛹率等强健性方面两者相仿，产量、一茧丝长、净度等主要经济性状均略低。天然黄色茧率100％，且茧色较均匀，是一对强健性天然黄色茧特殊用途蚕品种。2012年6月通过广西农作物品种审定委员会审定。

Breeding of natural yellow cocoon silkworm variety Guican H9

Guican H9, matched and incubated by Guangxi Sericulture Technology Extension Station, was the new robustness silkworm variety used in summer and autumn for special purposes. The results of its cocooning rate, larva-pupa rate, filament length of a cocoon, reelability and neatness were 97.29%, 95.99%, 849.51m, 74.09% and 91.84 points, respectively in the joint identification of provincial laboratory, while the results in the joint identification of provincial countryside were like this： 31.47 kg of leaflets produced cocoon, 712.0m of fila-ment length of a cocoon, 68.06% of reelability and 92.26 points of neatness. Compared with the current promo- tion variety Liangguang Ⅱ, the differences of cocooniug rate, larva-pupa rate and other robustness traits weren＇t significant, but the major economic traits like yield, filament length of a cocoon and neatness were all slightly lower. Rate of natural yellow cocoon was 100%, and the cocoon color was uniform, suggesting that it was a new robustness silkworm variety for special purposes, thus it was validated by Guangxi Crop Variety Approval Com-mittee in June 2012.