In vitro inhibitory effect of fungicide and plant extracts on mycelium growth of Alternaria solani

All the eight fungicides (mancozeb, chlorothalamine, copper hydroxide, metiram, propineb, carbendazim + mancozeb, Cynoxamin + mancozeb and fenomidone + mancozeb reduced the disease severity as compared to untreated check. The highest reduction in the disease was achieved by applying fenomidone + mancozeb that caused 95.1% inhibition of mycelial growth of A1 strain of Alternaria solani. Among plant extract evaluated, neem leaf extract (8%) was effective in causing 41.6% inhibition of mycelial growth in A1 strain of A. solani followed by neem karnal extract, garlic bulb extract, onion bulb extract and Calotropis leaf extract. Thus, the present study revealed that plant extract have shown significant inhibition and proved to be cost effective and ecofriendly for the management of A. solani and were comparable with fungicides, if applied at low dosages and need based.