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关于稻叶瘟的防治指标,国内外已有不少研究报道,但以往的防治指标中缺乏反映病情发展动态的定量指标,有进一步改进之必要。因此,本协作组自1986～1990年间对此问题进行了研究,研究结果如下。1 稻叶瘟的经济损失允许水平1.1 允许损失率:从防治叶瘟本身的收益与防治成本相当(防治叶瘟肯定可减轻后期穗瘟病情,故单纯从防治叶瘟角度看得失相当,但连同穗瘟一起考虑则是有效益的)这一前
As for the prevention and cure index of rice leaf plague, there are many reports at home and abroad, but there are no quantitative indicators reflecting the development of disease in past prevention and treatment indicators, which are necessary for further improvement. Therefore, this group has carried on the research to this question from 1986 to 1990, the research result is as follows. 1 The economic loss allowable level of rice leaf blast 1.1 Allowable loss rate: From the prevention and treatment of leaf plague itself, the benefits and costs of prevention and control (prevention and treatment of leaf plague will certainly reduce the late panic disorder, it simply from the prevention and treatment of leaf blast point of view, but lost, but together with Head blast together considered effective) before this