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防治害虫的目的是保住产量。如果不知道昆虫侵害农作物对产量会有多大影响,就不能制定出合理的防治指标,对害虫的数量预测就失去了数量目标。 早在1961年,Tammes就描绘了昆虫数量(或为害量)与产量关系的一般反应曲线(见图)。虽然这条曲线不能符合所有昆虫的为害特性,但明确地指出了在一定虫量范围内对作物产量形成是没有影响的,而超出这范围时还可以有一定的补偿作用。这就是制定为害量阈限水平的概念上的依据。
The purpose of pest control is to keep production. If you do not know how much impact the insects will have on crop yield, you will not be able to formulate a reasonable target for prevention and control and you will lose the quantitative target for the prediction of the number of pests. As early as 1961, Tammes portrayed the general reaction curve of insect quantity (or amount of damage) to production (see figure). Although this curve does not fit all insect pests, it clearly indicates that there is no impact on crop yields within a certain range of insects, and beyond that range there is a certain amount of compensation. This is the conceptual basis for setting the threshold level of harm.