Evaluation of antifungal activity of sodium salts against onion basal rot caused by Fusarium oxysporum f.sp. cepae

Abstract

Türkkan M., Erper I. (2014): Evaluation of antifungal activity of sodium salts against onion basal rot caused by Fusarium oxysporum f.sp. cepae. Plant Protect. Sci., 50: 19-25.The efficacy of twelve sodium salts as possible alternatives to synthetic fungicides for the control of onion basal rot caused by Fusarium oxysporum f.sp. cepae was evaluated. In vitro tests showed that there were significant differences between the inhibitory effects of sodium salts on the mycelial growth (P ≤ 0.05) and 2% (w/v) concentrations of sodium metabisulfite and sodium fluoride completely inhibited mycelial growth of the fungus, while other salts did not. Sodium metabisulfite and sodium phosphate monobasic had lower pH values than the other salts. Unlike sodium metabisulfite, sodium phosphate monobasic could not decrease the mycelial growth. The ED 50 , minimum inhibition concentration (MIC), and minimum fungicidal concentration (MFC) values indicated that sodium metabisulfite was more inhibitory to the fungus compared to sodium fluoride. In soil tests, inhibitory effect of sodium metabisulfite on the fungus was higher than that of sodium fluoride, where sodium metabisulfite completely inhibited mycelial growth at even 0.4% concentration.

Effectiveness of pH and Butylated Hydroxyanisole (BHA) on Fungicidal Activity of Certain Fungicides for Controlling Green and Blue Mold Diseases on Orange Fruits

“…The results in Table (3) show that pH 3 and 9 slightly controlled the incidence of green and blue molds on orange fruits by 20.83 % and 29.17 % and by 25.0 % and 37.5 %, respectively, and basic pH value was more effective than acidic pH. These findings are in agreement with other previous studies (Eckert and Eaks, 1989;Pitt and Hocking, 1997;Smilanick et al, 2005Smilanick et al, , 2006Smilanick et al, and 2008Guo et al, 2014;Turkkan andErper, 2014 andGhadimipour andSedigh-Eteghad, 2015).…”

“…A study was conducted to estimate the fungicidal activity of the tested fungicides and antioxidant either separately under defined pH values or in mixtures under native pH medium. The effect of pH on mycelial growth of fungi was examined by adjusting (PDA) at 3.0 to 11.0 using 1.0 N NaOH or HCl prior to autoclaving, the degree of pH was determined by the pH meter (Turkkan and Erper, 2014). The fungicides were diluted in sterile distilled water, then added to cooled PDA medium at concentrations of 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1.0, 2.5, 5.0 and 10.0 µg a.i.…”

In‐vitro antifungal activity of several biorational fungicides against Calonectria pseudonaviculata, the causal agent of Buxus hyrcana blight

“…Although the use of chemical fungicides is a common control measure against box blight in ornamental situations, the potential effects of these treatments on the wider environment and human health make it necessary to find alternative strategies for disease management (LaMondia, ). The use of natural compounds such as organic and inorganic chemicals with low mammalian toxicity may be one of the better alternatives for disease control in natural environments (Olivier et al., ; Turkkan & Erper, ). However, before attempting to assess the efficiency of such compounds against boxwood blight in the forest, preliminary in‐vitro tests are required to evaluate their activities against both growth and spore germination of C. pseudonaviculata .…”

“…Biorational fungicides are active at low concentrations, have little or no adverse consequences for the environment and nontarget organisms, but are either lethal or suppressive to target fungi (Diver & Hinman, ; Horowitz, Ellsworth, & Ishaaya, ). Their fungicidal and fungistatic effects have been demonstrated on several fungal plant pathogens such as Botrytis cinerea (Mills, Platt, & Hurta, ; Zaker, ), Helminthosporium solani (Olivier, Halseth, Mizubuti, & Loria, ), Fusarium oxysporum (Arslan, Kadir, Vardar, & Karabulut, ; Elmer, ; Turkkan & Erper, ; Zaker, ), Alternaria alternata (Mills et al., ; Zaker, ), Rhizoctonia solani and Sclerotinia sclerotiorum (Arslan et al., ).…”

Effects of antifungal activity of essential oils, salts and antioxidants acids on pathogenic fungi and their application methods for controlling postharvest diseases in banana fruits

“…These results are in agreement with Dionisio and Koabyashi (2004) who found that organic and inorganic salts, that is, Na 2 CO 3 (4 g/L), NaClO (5 g/L), NaHCO 3 , CaCl 2 , and NaCl (6 g/L) completely inhibited spore germination of fungi causing crown rot diseases in banana, that is, L. theobromae, Thielaviopsis paradoxa, C. musae, C. gloeosporioides, Fusarium verticillioides, and Fusarium oxysporum. Turkkan and Erper (2014) found that sodium metabisulfite completely inhibited mycelial growth of F. oxysporum.f.sp.capae, the cause of onion basal rot.…”