关键词: 棉花; 土传病害; 立枯丝核菌; 拟轮枝镰孢霉; 尖孢镰孢霉; 大丽轮枝菌; 侵染动态

Abstract: 【Objective】 Rhizoctonia damping off, Fusarium red rot, Fusarium wilt and Verticillium wilt are four major soil-borne diseases on cotton in Xinjiang. This project aims to clarify the infection dynamics of the four diseases of cotton in Xinjiang and analyze the initial infection period and the best control period of each disease in the hope of providing a basis for the high efficiency prevention and control of the disease. 【Methods】In this study, specific primer PCR was used to detect the pathogen of four main diseases, and the dynamic analysis and mixed infection analysis of each pathogen were carried out according to the detection results.【Results】The results indicated that the four pathogens could be infested from the cotyledon stage of cotton; the infection of Rhizoctonia solani was detected relatively earlier and faster, followed by Fusarium verticillioides, the infection rate of the two pathogens was high in the early stage of cotton seedling and reached the peak at the three-leaf stage, and the detected rate decreased gradually after that. Although the Fusarium oxysporum and Verticillium dahliae could also be infected from the cotyledon stage, but the rate of detection in the cotyledon to the one-leaf stage was low, Until the time of the boll stage invasion plant rate was gradually increasing. The mixed infection between the pathogens was widely spread, and the mixed infection of the two species pathogens was the most common.【Conclusions】Cotyledon stage is the infection start period of four species pathogens. R. solani and F. verticillioides is characterized by seedling invasion, while F.oxysporum and V.dahliae is characterized by invasion from cotyledon stage to boll stage; There are often mixed infections among pathogens

Key words: cotton; soil-borne diseases; Rhizoctonia solani; Fusarium verticillioides; Fusarium oxysporum; Verticillium dahliae; infection dynamics