杨树桑天牛的防治孙文康江苏省新沂市自７０年代中期成功地引种杨树新无性系６９、７２杨以来，在生产上发挥了重要作用，现已成为农田林网、丰产林和四旁主要栽植树种。但同时，蛀干害虫桑天牛随之严重起来。该市从１９８６—１９８８年连续３年，不在林内防治虫株，采用... Prevention and control of poplar and crabgrass Sun Wenkang Xinyi City, Jiangsu Province, has played an important role in production since the successful introduction of poplar new clones 69 and 72 from the mid 1970s. Now it has become a major project of farmland stands, high yield forests and four main planting species . But at the same time, mulberry worm mulberry serious subsequent serious up. The city from 1986 to 1988 for three consecutive years, not in the forest control pest strains, using ...