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病、虫、杂草等的疫情效应具有“迟、长、难”的特点,即效应发生得迟,效应发生后的作用期长,难以预测效应的发生情况及发生后难以消除。疫情效应的这些特点,既增加了植物检疫工作的难度,恰也显示了植物检疫的重要性。1 疫情效应发生迟缓植物检疫工作有时不为人们所理解,其中一个重要的原因是疫情效应发生得较迟。它往往要在传人后的几年才会发生人们觉察到的效应。在没有看到效应时,人们对检疫工作的重要性往往认识不足。我国过去没有的美国白蛾、松突圆蚧、松材线虫病等病虫已在国内发现,根
The epidemic effects of diseases, insects and weeds are characterized by “long, long and hard”, that is, the effects are delayed and the effects are long after the effects occur. It is difficult to predict the occurrence of the effects and is difficult to eliminate after the occurrence. These characteristics of the epidemic effect not only increase the difficulty of phytosanitary work, but also show the importance of phytosanitary. 1 Outbreak of Epidemic Effects Slowly Phytosanitary work is sometimes not understood, and one of the important reasons for this is the late onset of the outbreak. It tends to take on the perceived effect of people only a few years after their succession. In the absence of an effect, people often fail to understand the importance of quarantine. In the past, the United States did not have the United States white moth, Scleractis sinensis, pine wilt disease and other pests have been found in the country, the root