The Relationship Between Occurrence Of Cotton Mulched With Plastic Film Fusarium Wilt And Meteorological Factors And The Research On The Resistant Mechanism Of Cotton Fusarium Wilt

In this study, the relationship between disease index and climate condition, resistance of cotton varieties,Susceptible and resistance mechanism of Cotton to Cotton Fusarium Wilt were investigated. It was suggested that Cotton Fusarium wilt had two obvious peaks with mulched plastic film contton in Xinjiang the same as other provinces,but priority there, base on investigating and analysising of the disease from 2003 to 2007. Disease had close relationship with the temperature and rainfall. Average temperature of five successive day was about 16℃, 20℃and above 24℃,disease explored the stage of emerging, developing very quickly and reducing, respectively. Disease elevated again with temperature dropping during July 20th and August 10th. Rainfall was the key factor too, the more rainfall, the more serious disease before June 15th.The results of the cultivars resistance in two years demonstrated that the majority of upland cotton varieties and materials for the resistance to fusarium disease showed a downward trend, but some varieties and materials were sensitive to fusarium disease . The results also illustrated that long-staple cotton were sensitive to fusarium disease.it was important factors that the rise of fusarium disease in this area.So in addition to strengthen breeding the resistant cultivars in upland cotton, rational arrangement of the variety in districts where land cotton and long-staple cotton mixing cropped should be adopted in order to alleviate cotton fusarium wilt.Though the research of Susceptible and resistance mechanism of Cotton to Cotton Fusarium Wilt,It was found that resistant material's PPO and PDO activity were obvious enhancement compared to susceptible material, their root exudation of the propagation of Fusarium oxysporum f. sp. Vasinfectum had significantly inhibited.It was found that the pathogen can invade the within cortical area of cells of susceptible and resistant varieties in three days after inoculation, but the cells were broken more in susceptible varieties in five and seven days after inoculation,It was not observed in resistant varieties.