现今使用的第一代杀真菌剂是在真菌进入植物之前就杀死它们。目前还较少使用的第二代杀真菌剂是在真菌进入植物组织后杀死它们。据美国Maryland大学植物系教授Hugh D.Sisler讲述,美国已研制成功第三代杀真菌剂。其作用方式是阻止真菌产生引起病害的能力,或刺激植物产生防御病害的能力。这种第三代杀真菌剂或称作“非真菌毒物”(nonfungitoxic),防治某些病害非常成功。有些这类化合物的作用方式是阻止真菌通过在 The first generation fungicides used today kill the fungus before they enter the plant. Second-generation fungicides, currently used less often, kill the fungus after it enters the plant tissue. According to Hugh D.Sisler, a professor of plant science at the University of Maryland, USA, the United States has successfully developed the third generation fungicide. Its mode of action is to stop the fungus from causing disease-causing ability or to stimulate the plant’s ability to defend against the disease. This third-generation fungicide, otherwise known as “nonfungitoxic”, has been very successful in controlling certain diseases. Some of these compounds work by blocking the passage of fungi