论文部分内容阅读
孟滦林管局由于森林面积大,纯林较多,气候条件复杂,给森林病虫害的发生、繁殖创造了条件。近10年来,发生的虫种越来越多(主要有:油松毛虫、落叶松毛虫、落叶松尺蛾、落叶松腮扁叶蜂、油松叶小卷蛾、舞毒蛾),面积也越来越大(1993年发生面积8万亩,到2002年达到了17.73万亩),直接威胁着全局森林资源的安全,形势非常严峻。为此,该局高度重视,逐年加大工作力度,1993-1997年累计完成防治面积27.2万亩,防治效果94%,防治率83.4%;1998-2002年累计完成防治面积44万亩,防治效果
Due to the large forest area and more pure forests, the Mengluan Forest Management Bureau has complicated climatic conditions that have created conditions for the occurrence and propagation of forest pests and diseases. The past 10 years, more and more species of insects occurred (mainly: Dendrolimus tabulaeformis, larch caterpillar, larch moth, larch cheeked bee, Pinus tabulaeformis, Gypsy moth), the area is also more (The area of 80,000 mu in 1993 and the area of 177,300 mu in 2002) directly threatened the safety of the global forest resources. The situation is very grim. To this end, the council attaches great importance to increase their efforts year by year, from 1993 to 1997 completed a total area of 272,000 mu of prevention and control, prevention and control of 94%, prevention and control rate of 83.4%; 1998-2002, a total of 440,000 acres of completed control area, prevention and control effects