African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6688

Full Length Research Paper

Effects of long-term cotton plantations on Fusarium and Verticillium wilt diseases infection in China

 Lan Wang1,2, Hongzu Feng1, Liping Teng1, Xiaofei Chen1, Hongxia Dan1, Shiqiong Lu2, Jianmei Xu2 and Ligang Zhou2
1College of Plant Science, Tarim University, Alar 843300, Xinjiang, China. 2Department of Plant Pathology, College of Agronomy and Biotechnology, China Agricultural University (CAU), No. 2, Yuanmingyuan West Road, Haidian District, Beijing 100193, China.
Email: [email protected], [email protected], [email protected]

  •  Accepted: 22 February 2012
  •  Published: 12 March 2012

Abstract

The population density of Fusarium oxysporum f. sp. vasinfectum, disease index of cotton fusarium wilt along with the relation of the wilt disease and pathogen density in long-term cotton plantations were studied by the methods of dilution plating and field investigation. Microsclerotium densities of Verticillium dahliae and disease index of verticillium wilt were also studied. The results showed that both pathogen densities were first increased and reached their maximum at the 10th continuous cropping year and then, gradually decreased. Very similarly, the disease indexes of fusarium and verticillium wilts exhibited the same variation trend, thereby, indicating that disease-suppressive soil may be formed in long-term cotton plantations that need to be further studied.

 

Key words: Long-term cotton plantations, continuous cropping, fusarium and verticillium wilt diseases, Fusarium oxysporum f. sp. vasinfectum, Verticillium dahliae, microsclerotia, population density, disease-suppressive soil.