Author(s):

I Yesuraja and EG Ebenezar

Abstract: Chrysanthemum (Chrysanthemum morifolium) is one of the important flower crops grown in Tamil Nadu, India. Fusarium wilt of chrysanthemum is causing damage in both green house and field conditions. The twelve isolates of Trichoderma viride were screened against Fusarium oxysporum f.sp chrysanthemi by dual culture method. A pot culture experiment with nine treatments was conducted using the promising Trichoderma viride of Tv-NK in the glass house at Agricultural College and Research Institute, Madurai, to assess the efficacy of isolate and the time of application of antagonist in managing wilt disease of chrysanthemum caused by Fusarium oxysporum f.sp chrysanthemi. The experimental results revealed that the treatment T₆ comprising of soil application of Tv-NK (2.5 kg talc-based formulation/ha) at 30, 60 and 90 DAP with root dipping of Tv-NK (0.2%) (T₂) recorded the least disease incidence of 12.58 PDI as against 88.88 PDI in the pathogen inoculated control and thus accounted for the highest disease reduction of 85.04 per cent over control. It was followed by the treatments T_7-soil application of Tv- (2.5 kg talc-based formulation/ha) at 30,60,90 and 120 DAP with root dipping of Tv-NK (0.2%) by recording 15.03 PDI which accounted for 82.13 and 79.15 per cent disease reduction over control respectively. The comparative check T₈ comprising standard control (Carbendazim 0.1% soil drenching) was found to reduce the disease intensity by recording 7.40 PDI which accounted for 91.66 per cent disease reduction over control.

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