Abstract

In vitro and in vivo tests were carried out to study the inhibitory effect of mixtures of sodium orthophenylphenate, methyl-1-(butyl-carbamoyl)-2-benzimidazole (‘Benomyl’) and sodium orthophenylphenate, 2-(4-thiazolil)-benzimidazole (‘Thiabendazole’) on growth of strains of Penicillium italicum and P. digitatum resistant to sodium orthophenylphenate, ‘Benomyl’ and ‘Thiabendazole’. ‘In vitro’ tests showed a synergistic effect of the mixtures; 10 ppm of sodium orthophenylphenate and 10 ppm of the benzimidazolic compound in most cases resulted in complete growth inhibition. Navel oranges inoculated with P. italicum spores showed no damage after 7 days of incubation at 25°C and 80–90% relative humidity when treated with a mixture of 100 ppm of sodium orthophenylphenate and 100 ppm of Thiabendazole.

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