Since the introduction of Bordeaux mixture in 1885, copper fungicides have been widely used to control a broad range of plant pathogens. Some tridentate derivatives of salicylaldehyde benzoylhydrazones bind metals with strong affinity for copper. In vitro experiments had shown that fungitoxicity of certain hydrazones was dependent on the presence of Cu and suggested a mode of action involving enhanced Cu delivery.  Greenhouse evaluations were performed to determine synergism in Cu-hydrazone mixtures against the potato late blight pathogen Phytophthora infestans. Treatments with a hydrazone alone had no significant effect (p = 0.08) against P. infestans with 26% control at 400 micromolar, the highest concentration evaluated. Synergism was evident when the hydrazone was combined with different copper materials including Cu(OH)2 in the form of Kocide� 2000, CuSO4, and CuCl2.  The copper-hydrazone mixtures comprising different molar ratios produced synergistic interactions in nearly all combinations superior to the commercial fungicide Kocide� 2000.

Hydrazone-copper complex as an alternative to control the potato late blight <i>Phytophthora infestans</i>

248th National Meeting (2014)

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Hydrazone-copper complex as an alternative to control the potato late blight Phytophthora infestans