在田间,特别是在果园里,我们常把两种不同药剂混合起来喷洒,以节省喷药次数并同时兼治多种病虫害。有时候看到了防治效果比单用某种药有些提高,便很容易联想到增效现象(synergism)。可是这种研究应该谨慎地进行,有无增效的结论也不该轻率地做出。很多所谓的 In the fields, especially in the orchards, we often spray two kinds of different medicaments together to save spraying times and at the same time control a variety of pests and diseases. Sometimes it is easier to think of synergism when you see that the effect of prevention is somewhat better than that of a single medicine alone. However, such studies should be conducted cautiously and the conclusions of whether there is synergy or not should not be taken lightly. A lot of so-called