Inactivation of sclerotia of Macrophomina phaseolina under paddy cultivation
Zaki, M.J.; Ghaffar, A.
Pakistan Journal of Botany 20(2): 245-250
Viability of sclerotia of Macrophomina phaseolina was examined in field under paddy cultivation for two consecutive years. After 12 weeks sampling, number of sclerotia were eliminated from surface and 20 cm depth at Rice Research Experimental Station, Kalashah Kaku, Lahorne and declined by up to 60-83% at the University Experimental Station, Karachi [Pakistan]. Whereas sclerotia survived under dry fallow treatment, soil flooding significantly reduced number of sclerotia by 95% in fields without paddy and 81% with paddy cultivation after 12 weeks as compared to 15% reduction in fields without paddy and 7% with paddy cultivation in plots irrigated daily. Macrophomina infection on cotton seedlings declined by 100% in flooded field without paddy and 80% with paddy crop as compared to 25% reduction in daily irrigated treatment without paddy cultivation and 38% with paddy. Soil flooding with or without paddy cultivation holds promise in the inactivation of sclerotia of Macrophomina from infested field.