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皖南山区森林资源丰富,松类在林业经济中占着很大比重。以宣城地区为例,现有森林地42.2万 ha,其中松类13.2万 ha。“八五”期间承担国家造林项目任务2.7万 ha,其中松类(火炬松、湿地松、马尾松)1.4万 ha,另外拟计划营造合资木浆林5.2万 ha。随着大规模的人工造林,改变了原有的自然生态系统,森林病虫害日趋严重。1991年夏秋我区宁国、广德、绩溪、郎溪、宣州4县一市发生大面积松黄叶蜂危害,面积达1.6万 ha,成灾面积0.4万 ha,其中针叶被食尽面积1110ha。松黄叶蜂危害成灾后,松树生长受到严重影响,部分中幼树木死亡,损失惨重。一、松黄叶蜂生活史及生活习性
Mountain forests in southern Anhui rich in resources, pine in the forestry economy accounts for a large proportion. Taking Xuancheng area as an example, there are 422,000 ha of existing forests, of which 132,000 ha are loose. During the Eighth Five-Year Plan period, China will undertake 27,000 ha of afforestation project tasks, including 14,000 ha of pine (Pinus taeda, Pinus elliottii and Pinus massoniana) and 52,000 ha of joint-venture wood pulp plantation. With the massive afforestation, which has changed the original natural ecosystem, the pests and diseases in the forest are getting worse day by day. In summer and autumn of 1991, a large area of pine leaf bee was damaged in Ningguo, Guangde, Jixi, Langxi and Xuanzhou counties and cities, with an area of 16,000 ha and a disaster-affected area of 0.4 million ha. 1110ha. Pine leaf bee endanger the disaster, the pine growth was severely affected, some young trees died, suffered heavy losses. First, pine yellow leaf bee life history and habits