我场松林已进入经营管理时期,病虫防治成为突出问题之一。今年6月在海拔500—900米四千余亩油松、赤松和黑松林发生了松扁叶蜂为害。在发生区,林木被害率达95%,虫口密度多的达数百条,少的也有七、八十条,个别树株针叶全部被吃光。在阴坡、半阴坡较阳坡重,15年以上的大树较幼林重。 My field Songlin has entered the period of operation and management, pest control became one of the prominent problems. This year in June at 500-900 meters above sea level more than four thousand acres of Pinus tabulaeformis, Pinus sylvestris and Pinus thunbergii occurred pine flat leaf bee damage. In the area of ​​occurrence, tree damage rate of 95%, insect population density up to hundreds, less there are seven or eighty, individual tree needles all eaten. In the shady slopes, semi-shady slopes than heavy, more than 15 years younger trees heavier trees.