Abstract
Seventeen fungicides were tested, singly and in mixtures, on Phytophthora cactorum and P. cinnamomi in vitro, and on the disease development by Phytophthora infestons on tomato or potato leaves and Plasmopara viticola on grape vine leaves under greenhouse and field conditions. Results indicated synergistic interactions of different intensities up to a ratio of 7. Ratios were calculated by comparing theoretical with observed EC90 values of the mixture. Among mixtures containing phenylamide fungicides like oxadixyl, metalaxyl or cyprofuram, mixtures of oxadixyl with mancozeb and/or cymoxanil showed the highest synergism. When tested on Phytophthora or Plasmopara diseases under greenhouse conditions, the highest synergism was observed in combinations of oxadixyl with mancozeb, cymoxanil, or phosetyl-Al against both diseases; with fentin acetate, folpet or thiram against Phytophthora; and with captan or maneb against Plasmopara. None of the tested oxadixyl mixtures showed antagonistic interactions.
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