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杨于透翅蛾（SpheciaSiningensisHsu）是青海省东部地区危害杨树主杆的主要害虫之一。被害树干内虫道纵横，严重影响木材质量和使用价值、是青海省森林植物检疫对象。我们在观察杨干透翅蛾种群消长规律的过程中，发现杨子透翅蛾种群的消长与林木生长势有很大的相关性。1调查方
Yang in the moth (SpheciaSiningensisHsu) is the eastern part of Qinghai Province, one of the main pests endanger the poplar. Insect tree trunks vertical and horizontal, seriously affecting the quality of timber and the value of use, is the object of quarantine of the forest plants in Qinghai Province. In the process of observing the growth and decline of Populus euphorbiae, we found that there is a significant correlation between the growth and decline of Populus euphratica population and the forest growth potential. 1 investigation party