Antifungal Effect of Various Salts Against Fusarium oxysporum f.sp. cepae, the Causal Agent of Fusarium Basal Rot of Onion

Authors : Muharrem Türkkan

Pages : 178-187

Doi:10.1501/Tarimbil_0000001243

View : 21 | Download : 5

Publication Date : 2013-09-29

Article Type : Research Paper

Abstract :This study was performed to evaluate the efficacy of 26 different salts as possible alternatives to synthetic fungicides for the control of Fusarium oxysporum fsp. cepae, the causal agent of Fusarium basal rot. A preliminary evaluation of the salts in vitro tests was performed at 2% insert ignore into journalissuearticles values(w/v);. Among these salts, potassium acetate, potassium chloride, potassium nitrate, potassium phosphate dibasic, sodium chloride, sodium sulfate and trisodium phosphate enhanced the mycelial growth of the fungus compared to that of control insert ignore into journalissuearticles values(P ≤ 0.05);. Except for diammonium phosphate, 15 other salts reduced mycelial growth to some extent insert ignore into journalissuearticles values(16.61-83.44%); insert ignore into journalissuearticles values(P ≤ 0.05);. Ammonium bicarbonate, ammonium carbonate and sodium metabisulfite completely inhibited mycelial growth, therefore used for further testing in soil. There were no significant differences between the inhibitory effects of ammonium bicarbonate, ammonium carbonate and sodium metabisulfite on the mycelial growth of the fungus insert ignore into journalissuearticles values(P ≤ 0.05);. However, the LD50, minimum inhibition concentration insert ignore into journalissuearticles values(MIC);, and minimum fungicidal concentration insert ignore into journalissuearticles values(MFC); values found that sodium metabisulfite was more toxic to the fungus compared to two other salts. In soil tests, sodium metabisulfite completely inhibited the fungus at 0.4%. In contrast, ammonium bicarbonate and ammonium carbonate was able to inhibit the fungus at the highest concentration used in the study insert ignore into journalissuearticles values(P ≤ 0.05);. The present study showed that F. oxysporum f. sp. cepae grow both on acidic and basic pH values. The fungus grown without inhibition between pH 6 and 9, but significantly decreased at higher and lower pH values insert ignore into journalissuearticles values(P ≤ 0.05);. At pH 12, the mycelial growth was completely inhibited.
Keywords : Fusarium oxysporum fsp cepae, alternative control, salts, toxicity