近年来,由于茭白施肥水平的提高,病虫害日趋严重。不少茭农在病虫害的防治上,采用高毒农药,并且提高使用浓度,增加防治次数,致使农本增加,环境污染加重。椐调查,每亩施药费用1982年不足20元,1984年猛增到30元以上,最高达45.15元。为促进茭白生产的发展,必须根据茭白病虫害的发生特点开展防治。 In recent years, pest and disease have become increasingly serious due to the improvement of the fertilization level. Many farmers pay attention to the prevention and control of pests and diseases, adopt highly toxic pesticides, and increase the use of concentration, increase the number of prevention and control, resulting in increased agricultural costs and increased environmental pollution.椐 survey, the cost of pesticide application per acre less than 20 yuan in 1982, soared to more than 30 yuan in 1984, up to 45.15 yuan. In order to promote the development of Zizania caduciflora, prevention and control must be based on the occurrence characteristics of Zimbabwe.