Efficacy of two fungicides for the management of Phytophthora infestans on potato through different applications methods adopted in controlled conditions
Publication Date : 09/12/2016
In an attempt to develop an alternative strategy, it is interesting to assess the best method of fungicide application, the position of the leaflets treated and the effect of a reduced dose on the infection level. Two fungicides, Ridomil Gold® and Copper Nordox® were evaluated to control mildew infection caused by Phytophthora infestans on potato (cv. Bintje). Hyphal growth of P. infestans was reduced by using Ridomil Gold® at 50 mg/L a.i (33.96%) compared to Copper Nordox® (54.28%) and untreated control (100%). Both Ridomil Gold® and Copper Nordox® indicated that spray application method on the lower side revealed a reduction of infection level. The other methods such as dipping and placing drop using Copper Nordox® revealed a decrease of mildew necrosis areas. The infection levels inhibition reached 53.94% and 56.62%, respectively (control=100%). It could be suggested that the use of fungicides Metalaxyl at low dose preventively could be efficient to control potato late blight in vitro and might be used for controlling this disease of potato plants under field conditions. Keywords: Phytophthora infestans, potato, dose, fungicide application, position treated leaflets.
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