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在白边地老虎发生危害地区,对幼虫危害程度的预报方法,是统计上年糖蜜或黑光灯诱集成虫的数量,以及在上年秋末或当年早春分不同地形、地势和前茬等进行田间取样调查。检查越冬卵数量,或在幼虫初龄期进行密度检查,据此发出当年幼虫可能发生危害程度的预报,指导防治工作。但是,白边地老虎幼虫是不均匀分布的地下害虫,取样调查不仅工作量特大,而且往往因调查地块不同,所得出的数据差别很大,不易正确指导防治。
In the white border area tiger damage area, the risk of larval forecast method is to count the number of the last year, molasses or black light trap adults, as well as in late autumn or early spring when different terrain, terrain and cropland before the field Sample survey. Check the number of overwintering eggs, or the density of the larvae in the early age check, which issued a warning of the possible occurrence of larvae in the forecast, guide the prevention and control work. However, the white-spotted tiger larvae are unevenly distributed underground pests. Sampling survey is not only extraordinarily heavy workload, but also often due to different survey plots, the data obtained are very different, not easy to correctly guide the prevention and treatment.