Efficacy of Different Fungicides against Leaf Blight of Carrot Caused by Alternaria alternata (Fr.) Keissler

Abstract

Background: Leaf blight disease is painful nerve to carrot growing farmer because it causes huge economic loss to the farmer every year. Leaf blight of carrot is seed and soil borne disease causes by Alternaria alternata. Hence management of the disease by fungicides is the best alternative. Therefore, in the present investigation, our main emphasis was to identify best fungicide for management of leaf blight of carrot. Methods: Seven fungicides were tested against leaf blight pathogen (Alternaria alternata) in lab as well as in cage house condition. The experiment was conducted at Cage house of department of Plant Pathology, COA, Jodhpur during Rabi-2020-21. Result: Among all the fungicides used in the present investigation, difenoconazole 25% inhibited the 100% mycelial growth at all the concentrations. The next best treatment was tebuconazole 50%+trifloxystrobin 25% inhibited the 99.02% mycelial growth and Minimum mycelial growth inhibition was observed in mancozeb 75% WP followed by carbendazim 12%+mancozeb 63% 61.58% and 77.70%, respectively; along with control plate was showed 100% mycelium growth. The superior treatments under in vitro carry forward in vivo condition. When applied as foliar application under cage house condition, difenoconazole 25 EC at 0.25 ml/lit (11.17%) was observed lowest disease incidence.