The survival of Fusarium oxysporum f. sp. ciceri in the soil in the absence of chickpea uri icon

abstract

  • Fusarium wilt of chickpea (Cicer arietinum), caused by F. oxysporum f.sp. ciceris, is a seed- and soil-borne disease of economic importance. The fungus is systemic and can be isolated from all parts of the infected plant including seed. The survival of the fungus in crop residues was studied during 1978-84. Wilted plants were collected in Mar. 1978 to study fungal survival in leaflets, terminal branches, stems and roots. Infected plant parts were buried in the soil (Vertisol). The fungus could not survive in the leaflets stored in the lab. or soil for more than 2 months, but it could survive in terminal branches for 6 months in the lab. and 9 months in the soil. The fungus could survive on crop residues (root and stem portions) buried in the soil for at least 72 months. The pathogen within the host tissue could not survive in flooded soil for more than 65 days; however, it could survive for over 200 days in soil which was kept continually wet. Influence of crop rotation and intercropping on wilt incidence in chickpea was studied during 1980-83. The crops included were sorghum, maize and wheat. The study was conducted in a portion of a wilt sick plot, developed at ICRISAT Centre, Patancheru, using a highly susceptible cultivar JG 62. At the end of a 3-year study, no significant reduction in wilt incidence was observed

publication date

  • 1995