棉花枯萎病的发生影响因子浅析

通过多年观察与系统调查研究表明，棉花枯萎病发病的主要影响因子是气候、土壤和栽培措施。棉花枯萎病发生的最适土温为25℃左右；土温达到30℃以上时，则会造成症状的隐蔽；在适温条件下，雨水多、分布均匀，则发病重；棉株不同生育阶段对枯萎病的感病程度也有很大影响，棉花枯萎病的发病高峰期基本上处于现蕾期；抗病品种的应用、合理的栽培措施及优良的土壤结构均可以减轻棉花枯萎病的发生。

A Brief Analysis on Impact Factors of Cotton Fusarium Wilt Occurring

It was suggested that cotton fusarium wilt（Fusarium oxysporum f. sp. Vasinfeetum） pathogenetie degrade were mainly affected by climate, soil and cultivate measures with observation and system investigation for many years. The optimum soil temperature triggering cotton fusarium wilt was about 25 ℃, and when soil temperature was over 30℃, pathogenetic symptom of cotton fusarium wilt would not easily be observed. Cotton fusarium wilt pathogenetic grades would become higher in eonditions of optimum soil temperature and more well-distributed rain. Cotton fusarium wilt differed in pathogenetic degrade in different cotton growth stages, and it generally broke out in budding period. Cul- tivars resistant to fusarium wilt, advisable cultivate measures and reasonable soil structure would alleviate cotton fusarium wilt.