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病虫害的经济为害水平或者经济阈值是有害生物综合治理(ＩＰＭ)的中心概念,是制订综合防治方案必需明确的数值指标。化学防治则是ＩＰＭ防治措施中见效最快、效果显著的重要措施,是减轻病虫害的危害损失的重要手段〔1〕。化学防治指标是ＩＰＭ实践上运用最多的数据,是指害虫的
The pest level of economic harm or economic threshold is the central concept of Integrated Pest Management (IPM) and is a clear numerical indicator that must be taken to develop an integrated control program. Chemical control is the most effective IPM prevention and control measures, the effect of significant measures to reduce pests and diseases harm the loss of an important means 〔1〕. Chemical control indicators are the most widely practiced IPM data in practice, referring to pests