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一、水稻病害消长演替特点及主要原因分析纵观我县水稻病害近三十年来消长演替过程,具三大特点:一是造成经济损失的病害种类由少到多,二是病害发生面积扩大,三是病害造成的损失增加。左右病害发生、流行的原因,从传统植病流行学分析,可归结为病源、寄主及环境条件相互作用的结果。但从现代的观点来看,对处于农业生态系统中的水稻病害,人类生产活动的影响却是导致其消长演替的重要因素.(一)品种更替对病害消长演替的影响由于目前同一品种对不同病害抗性不同。这样,在利用抗病品种防治病害的过程中,有可能控制住了原来大流行的病害,但是原来不重要的病害有可能随之上升,成为新问题.
First, the characteristics of rice disease growth and decline and the main reasons for analysis of rice disease in our county over the past 30 years the process of growth and decline, with three major characteristics: First, the economic loss of the disease from less to more, and second, the area of disease Expand, the third is the damage caused by the disease increased. About the occurrence and prevalence of diseases, the epidemiological analysis of traditional plant diseases can be summarized as the result of the interaction between pathogen, host and environmental conditions. However, from a modern point of view, the impact of rice diseases and human activities in agro-ecosystem is an important factor leading to their succession and decline. (A) the impact of breed change on the succession and decline of diseases As the same species Different resistance to different diseases. In this way, the use of disease-resistant varieties of disease prevention and control may be able to control the disease of the original pandemic, but previously not important diseases may increase, as a new problem.