In-vitro Evaluation of Fungicides Against Radial Growth of A. brassicae

Eight commercially available fungicides were evaluated in-vitro for their efficacy to inhibit radial growth of Alternaria brassicae using poison food technique. All the fungicides evaluated were found to be significantly effective at all their tested concentrations, however, Propiconazole and Hexaconazole were the most effective to exhibit cent percent inhibition in radial growth of A. brassicae, even at their lowest tested concentration (50 ppm). Complete inhibition of mycelial growth of test pathogen was also recorded in case of Vitavax and Flusilazole but at their relatively higher concentration (150 ppm). Azoxystrobin + Difenoconazole and Propineb were the next best fungicides in terms of mycelial inhibition at all the tested concentrations i.e., 50, 100, 150 and 200 ppm. Efficacy of fungicides like Propiconazole, Hexaconazole, Azoxystrobin + Difenoconazole and Propineb remained constant with 100% inhibition at their higher concentrations, i.e., 200 ppm. Mancozeb was found to be least effective with maximum mycelial inhibition of 86.08% at 200 ppm, however, the lower concentrations like 50, 100 and 150 ppm exhibited 53.33%, 54.74% and 64.61% radial growth inhibitions, respectively.