甘肃省张掖市九龙江有一片沙枣幼林,平均树高6米,是张掖地区风沙线上的主要屏障,对防止风沙灾害,保证农田丰产起着重要作用。杀虫前沙枣尺蠖全面发生,危害严重,虫的密度每树平均600条,最多达2000余条,大部树叶被吃光。为积极有效地消灭虫害,保护沙区林木,促其速生丰产, Jiulongjiang, Zhangye City, Gansu Province has a jujube jujube with an average height of 6 meters, which is the main barrier of wind and sand in Zhangye area. It plays an important role in preventing wind-blown disasters and ensuring high-yield farmland. Dried jujube scales before the pesticide occurred in full scale, serious harm, the average density of insects per 600 trees, up to more than 2000, most of the leaves are eaten. In order to eliminate pests actively and effectively, protect sandy areas and promote fast-growing and high-yielding,