Vol. 10, Issue 12 (2021)

Author(s):
Vijaykumar KN, Shripad Kulkarni, PV Patil, DN Kambrekar and TR Shashidhar

Abstract:
Garlic (Allium sativum L.) is the second most widely cultivated bulb crop after onion in several countries. It is susceptible to number of diseases at various stages of plant growth. Among those, purple blotch caused by Alternaria porri (Ellis) Cifferi, is the most destructive disease of garlic causing yield loss about 25-60 per cent. In the present study new molecules of contact, systemic and combi product fungicides were tested against Alternaria porri by poison food technique at different concentrations. The contact fungicides were tested at three concentrations (0.1, 0.2 and 0.3%) and found maximum mycelial growth inhibition with mancozeb 75% WP (62.84, 74.81 and 76.42% respectively). In systemic fungicides, three concentrations (0.05, 0.1 and 0.15%) were tested and propiconazole 25% EC recorded 100 per cent inhibition at all the concentrations. The cent per cent inhibition was also noticed in tebuconazole 250 EC only at 0.15 per cent concentration. Among the combi product fungicides tested at three concentrations (0.05, 0.1 and 0.2%), maximum inhibition of mycelial growth (100%) was noticed in fluopyram 17.7% + tebuconazole 17.7% (Luna Experience 400 SC) at three concentrations and found to be most effective and significantly superior over rest of the combi product fungicides. Whereas, least mycelial growth inhibition of Alternaria porri was observed with chlorothalonil 75% WP (35.80%), carbendazim 50% WP (20.23%) and (iprovalicarb 5.5% + propineb 61.25% WP) (29.91%) among the contact, systemic and combi product fungicides tested respectively.