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张掖市九龙江风沙线上,有沙枣林5万余亩。56年以前,沙枣尺蠖虫害年年猖獗,使沙枣年产量由原来的8万多斤降低到7千多斤,1956—1958年,运用药剂防治,人工扑打相结合的措施,开展了大面积防治,不但使年产量得到恢复,57年沙枣产量提高到12万多斤。几年来我们防虫的方法有如下几种:一、堆沙阻杀:利用雌蛾无翅必须爬行上树的弱点,当害虫出土以前(3月上旬),即在树干基部周
Zhangye City, Jiulongjiang sand on the line, there are more than 50000 acres of jujube forest. 56 years ago, sand date pest insects rampant year by year, so that annual output of jujube from the original 80,000 kilos down to 7 kilograms, 1956 - 1958, the use of chemical control, artificial beating a combination of measures to carry out large Area control, not only to restore annual output, 57 years of jujube production increased to 120,000 kilosters. In recent years, we have the following methods of pest control: First, the sand kill: the use of the female moth wings must crawl the weakness of the tree, before the pests unearthed (early March), that is, the base of the trunk week