Abstract

Phytophthora cactorum (Lebert & John) Schroeter is the most widespread plant pathogen causing root and crown rot of apple worldwide, also in Turkey. Effect of different concentrations of some fungicides against mycelial growth of P. cactorum in culture medium was studied in 2011. EC50 values of the fungicides for two pathogen isolates were 3.6 and 3.7 µg/ml of Metalaxyl-M+Mancozeb, 8 and 12 µg/ml of Captan, 25 and 26 µg/ml of Hymexazol, 92 and 99 µg/ml of Fosetyl-Al, 83 and 112 µg/ml of Phosphorous Acid, 1023 and 2660 µg/ml of Propamocarb+Fosetyl-Propil. Effect of some fungicides against root and crown rot disease caused by P. cactorum was evaluated on apple rootstocks of MM.106 grown in artificially infested soil in 2012. Hymexazol, Captan, Trichoderma harzianum and Metalaxyl-M+Mancozeb caused 21.66%, 26.66%, 33.33% and 58.33% inhibition respectively, whereas Fosetyl-Al and Phosphorous Acid provided 100% inhibition of P. cactorum infection on the roots of apple rootstocks.

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