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农作物病虫害的发生,常受生物和非生物等因素的综合影响,其盛发流行都有一个发展过程,预测预报就是运用科学的调查观测方法,掌握病虫害的发生发展趋势,及时发出预报,以指导防治工作,为农业生产服务。病虫害预测预报较常用的方法是: 一、病害方面: 农作物病害的预测,主要是掌握其流行规律。一般病害流行要具备三个因素:即病原、适宜的环境条件、寄主的感病性。我们要从三者的相互关系进行观测研究,抓住重要环节来分析预报病情的发展趋势。农作物病害的病原有线虫、真菌、细菌、病毒等,其初次侵染或
The occurrence of crop pests and diseases is often affected by the combined effects of biological and non-biological factors. The epidemic has a development process. Prediction and forecasting is the use of scientific investigation and observation methods to grasp the occurrence and development trend of pests and diseases, timely issue forecasts to guide Prevention and control work for agricultural production services. Pest forecasting methods are more commonly used: First, the disease: Crop disease prediction, mainly to master the prevalence of the law. The prevalence of common diseases to have three factors: the pathogen, the appropriate environmental conditions, the host’s susceptibility. We need to observe and study the interrelationship among the three and grasp important links to analyze the trend of development of the prognosis. Pathogen of crop disease nematodes, fungi, bacteria, viruses, etc., its initial infection or