Author(s):

M Lakshmi Naga Nandini, SM Rajesh Naik, CH Ruth and K Gopal

Abstract: An experiment was conducted to study the compatibility of fungicides with bacterial and fungal biocontrol agents under in vitro conditions with seven fungicides commonly used in management of turmeric diseases by poisoned food technique for fungi, inhibition zone technique for bacteria. Each fungicide was tested at three concentrations viz., 0.05%, 0.1% and 0.2%. The results of the study proved that, bordeaux mixture and carbendazim (12%) + mancozeb (64%) were incompatible and showed cent percent inhibition on the growth of the fungal antagonist. Cymoxanil (8%) + mancozeb (64%) at 0.1 per cent concentration recorded lowest inhibition of 13.58 per cent on the growth of the fungal bioagent. Mancozeb (4%) + metalaxyl-M (64%), carbendazim (12%) + mancozeb (64%), Cymoxanil (8%) + mancozeb (64%), mancozeb, lower concentration of fenamidone (10%) + mancozeb (50%) were compatible with bacterial antagonist. The other fungicides recorded the inhibition in the growth of the bacterial antagonist in the range of 9.5 to 21.35 per cent. Among copper fungicides, bordeaux mixture was more inhibitory than copper oxychloride (50%) with bacterial antagonist.

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