冬伐形式对桑树的花叶病抗性及春叶产量和叶质影响的研究

A Study of the Effect of Winter Pruning Method of Mulberry on Resistance to Mosaic Disease and the Yield and Quality of Spring Leaves

对７２ 个桑树杂交组合进行两种冬伐处理，研究冬伐形式对桑树的花叶病抗性、春叶产量和叶质的影响。结果表明：不同冬伐处理对桑树的花叶病抗性、春叶产量和叶质均有极显著的影响。采用冬留长枝的冬伐形式，可使花叶病的株发病率降低５５１７ ％ ，病情指数降低７３９９ ％ ，病害对产量的综合损失率降低８６４５ ％ ；桑树的总枝条长度、单位条长叶片数、单叶重分别增加３２９６％ 、１２３３ ％ 和２３７７ ％ ，从而使春叶产量大幅提高，平均增产１３５９３ ％ ；春叶的干物含量、可溶性糖含量、总糖含量显著提高，桑叶养蚕可使全茧量、茧层量、产卵数、良卵数分别提高３８８ ％ 、４１６ ％ 、６０ ％ 和６０％ 。

hybridized combinations of the mulberry were pruned with two pruning methods in winter for study of the effect of the winter pruning method of mulberry on resistance to mosaic disease,and the yield of spring leaves and the leaf quality.The results indicated that the effects were very significantly different.By the method of the high position pruning shoot in winter,the incidences of mosaic diseased plant,the disease index and the disease loss rate of leaf yield has decreased by 55.17%,73.99% and 85.21%,respectively.The total length of shoots of plant,the number of leaves per unit of shoot Length and the weight of simple leaf has increased by 32.96%,12.33% and 23.77%,respectively.Therefore,the leaf yields per unit of area were increaed greatly with the average increasing rate of 135.95%.The dry matter content,the soluble carbohydrate and total carbohydrate content of spring leaves were increased significantly.Silkworms were reared by this leaves and the weight of cocoon,the cocoon shell weight,the number of laid eggs and the number of good eggs has increased by 3.88%,4.16%,6.0%,6.0%,respectively.