Determination of the inhibitory effects of organic and inorganic salts against some fungi causing root rot disease on kiwifruit

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The efficacy of 21 organic and inorganic salts and Captan as a senthetic fungicide against threekiwifruit root rot pathogens including Fusarium oxysporum, F. solani and Rhizoctonia solani AG4 were evaluated in the present study. According to the preliminary in vitro trials, 7 compoundsincluding ammonium carbonate, ammonium bicarbonate, potassium benzoate, potassium sorbate,sodium benzoate, sodium metabisulphite and Captan (2 %) were able to completely inhibit mycelialgrowth of all three fungi. With few exceptions, this study showed that sodium metabisulphite had theED50, MIC and MFC values having a greater effect against the fungi than six other compounds. Soiltests showed that ammonium carbonate (0.75 %), ammonium bicarbonate (1 %), potassium sorbate (0.5%), sodium benzoate (0.5 %) and sodium metabisulphite (0.25 %) completely inhibited mycelial growthof R. solani AG 4, whereas Captan reduced the mycelial growth of the fungus by 95.23 %; however,differences among the inhibitory effects of treatments were found to be statistically insignificant(P 0.05). In addition, there was no significant differences among the inhibitory effects of 0.25 %sodium metabisulphite, 0.25 % Captan, 0.25 % potassium sorbate, 0.75 % ammonium carbonate and 1% ammonium bicarbonate against all three fungi (P 0.05). In the root tests, the treatments of 0.1 %sodium metabisulphite and 0.25 % Captan against each three fungi significantly reduced the severity ofroot rot in kiwifruit seedlings in comparison to the inoculated control plants, but 0.75 % ammoniumcarbonate, 1 % ammonium bicarbonate, 0.25 % potassium benzoate, 0.25 % potassium sorbate and 0.25% sodium benzoate did not (P 0.05).

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Alternative control. Captan. Fusarium oxysporum. F. solani. Rhizoctonia solani AG 4

Anadolu Journal Of Agricultural Sciences

302

Anadolu Journal Of Agricultural Sciences