Survey And Severity Of Tomato Wilt Disease Incited By Fusarium Oxysporum F. Sp. Lycopersici (sacc.) In Different Districts Of Tamilnadu

A survey was conducted to investigate the incidence and severity of tomato wilt caused by Fusarium oxysporum f. sp. lycopersici in ten major tomato growing districts of TamilNadu. Sivagiri in Tirunelveli district followed by Ponchamalli in Krishnagiri district recorded maximum PDI, whereas Vadakadu in district recorded minimum PDI. Isolates Fol 1 showed maximum growth rate/day followed by isolate Fol 17. Isolate Fol 1 was found to be highly virulent causing 100% wilt at 30 DAS in soil inoculation method followed by isolates Fol 17&Fol 18 in the decreasing order of merit. It is also proved that the variations in morphological characters correlates with the virility of the different isolates