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三、农业病害症状的识别农业病害的症状是病原与得病植物(寄主)在环境条件配合下相互作用结果的外观表现。症状由病状和病症两部分组成。病状指寄主在病原入侵后,其生理功能受到干扰或破坏,因而在寄主的组织、器官乃至形态上发生一系列的病理变化,这种寄主的病变乃称病状。通常将各种病状归纳为变色、坏死与腐烂、萎蔫和畸形4种类型。
Third, the identification of symptoms of agricultural diseases Symptoms of agricultural diseases is the pathogen and diseased plants (host) in the environmental conditions with the interaction of the appearance of the results. Symptoms and illness by the symptoms of two parts. Pathogenesis refers to the pathogen host invasion, its physiological function is disturbed or destroyed, so the host organization, organs and even a series of pathological changes occur, the host of the lesion is called the disease. Usually a variety of symptoms can be summarized as discoloration, necrosis and decay, wilting and deformities 4 types.