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杨干透翅蛾是锡林浩特地区杨树树干的主要害虫之一,虽然没有出现毁灭性的大灾,但是,每年都有程度不同的危害。经过调查发现,该虫生活条件要求严格,危害规律明显,为防治工作提供了依据,现将调查情况简述如下:1.概况调查地点位於锡林浩特市东郊,该地近十年(1970—1980年)年平均气温2.2℃,绝对最高气温为37℃,最低气温-38℃。最大冻土深度平均2.42米。生长期最长为12
Yang dry moth is one of the main pests of poplar trunks in Xilinhot. Although no catastrophic catastrophes occur, it has varying degrees of harm every year. After investigation, we found that the insects require strict living conditions and obvious harm laws, which provide the basis for prevention and control work. The survey is briefly described as follows: 1. Survey The survey site is located in the eastern suburbs of Xilinhot, the past decade (1970-1980 Year) The annual average temperature of 2.2 ℃, the absolute maximum temperature of 37 ℃, the minimum temperature of -38 ℃. The maximum depth of frozen soil average 2.42 meters. The longest growing period is 12