Antifungal Effect of Some Tannins on Fusarium oxysporum f. sp. cepae the Agent of Onion (Allium cepa L.) Root Rot Disease

The Fusarium oxysporum f.sp. cepae (FOC) is one of the most important agents causing significant crop losses. In this study, different doses (0,0.25, 0.5, 1.0, 2.0 and 4.0%) of three different commercial tannin extracts (Artutan K, Artutan and Farmatan) and one dose (0.05%) of a commercial fungicide (Antracol WP 70) were investigated, on FOC mycellium growth in vitro conditions. Results indicated that Artutan with K 4% concentration inhibited FOC mycellium growth at the highest rate of 76.4% compared to negative control. At the same concentration, Artutan and Farmatan inhibited FOC mycelial growth by 57.3% and 51.4%, respectively. In addition, 2% and 4% concentration of all tannin extracts and 1% concentration of Artutan K suppressed FOC mycellium growth more than Antracol WP 70 (p<0.05). Most of concentration was found to have antifungal effect, when different concentrations of three different tannin extracts were compared to negative control. We can conclude from this study that tannins can be used as an alternative to synthetic compounds in plant disease agents management.