New Group of Fungicides as the Potential Source of Management of Leaf Spot and Flower Blight of Marigold

Abstract

Background: Leaf spot and flower blight caused by Alternaria zinniae is serious disease of marigold causing yield loss of 50-60% in crop. Many previously used fungicides showed resistance against the pathogen. So the present investigation was carried out with an objective to study the efficacy of new fungicides available in the market using poison food technique. Methods: Eleven fungicides such as azoxystrobin, tebuconazole, azoxystrobin + tebuconazole, difenoconazole, azoxystrobin + difenoconazole, tebuconazole + sulphur, wettable sulphur, mancozeb, metalaxly, chlorothalonil, chlorothalonil + metalaxly were evaluated at the concentration of 0.1%, 0.15% ,0.1%, 0.1%, 0.1%, 0.15%, 0.25%, 0.3%,0.2%, 0.3% and 0.3% respectively. Result: The present investigation revealed that Azoxystrobin + Tebuconazole recorded maximum mycelial growth inhibition of 96.85% followed by Tebuconazole + Sulphur 96.40% and Metalaxyl of 95.50%. The least inhibition of 18.92% was recorded by wettable sulphur.