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实施杨树天牛综合防治技术,使我县杨树天牛的发生面积由1992年的3.2万亩下降到2万亩,发生率由32%下降到20%,示范点上的虫株率由综防前的
The implementation of comprehensive management of poplar day-care technology, so that the occurrence area of the poplar in our county from 3.2 million mu in 1992 down to 20,000 mu, the incidence dropped from 32% to 20%