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昆嵛山林场位于山东半岛北部,有林面积5万余亩,是山东省最大的林场之一。1953至1974年的21年间,松干蚧和松毛虫连年猖撅危害,有的年份重复防治十几遍。据林场统计,21年累积化学防治面积达1289905亩次,结果是年年治虫,越治越多,致使松林成批枯死,赤松所剩无几。1975年起林场总结了经验教训,采取封山育林、修枝间伐、引进抗虫树种、适地适树不拘形式地营造混交林等综合治理措施,取得了显著效果。11年没有使用化学农
Kunyu Mountain Forest Farm is located in the northern part of Shandong Peninsula, a forest area of more than 50,000 acres, is one of the largest forest farm in Shandong Province. From 1953 to 1974, 21 years of pine and desert scales and pine caterpillars year after year rampant hazards, and some years repeated prevention and control more than a dozen times. According to the statistics of forest farms, the accumulated area of chemical control in the past 21 years reached 1,289,905 mu, with the result that annual pests and diseases are more and more often caused. From 1975, the forest farms summed up the experiences and lessons learned, took the measures of closing hillsides and afforestation, thinning and pruning trees, introducing insect-resistant trees, and adapting trees to comprehensively establish mixed forests and other comprehensive control measures with remarkable results. 11 years did not use chemical farming