Abstract
Kresoxim-methyl (Stroby WG, Basf), a new strobilurin-based fungicide was tested for its activity on the germination of conidia of a population of Spilocaea oleagina, obtained from naturally infected leaves in southern Spain. The ED50 value was 0.02 μg a.i./ml, much lower than ED50 values given by cupric or organic fungicides used against this fungus in the field. Application of Kresoxim-methyl on olive leaves with sporulated scab lesions reduced up to 79% the viability of conidia as compared with non-treated scab leaves, regardless of fungicide concentration. However, when different tensioactive products were added to the fungicide, the reduction of conidia viability increased to 99%. The protective and curative action of Kresoxim-methyl was evaluated with artificial inoculations on potted olive plants in the greenhouse. The protective effect of Kresoxim-methyl was slightly lower than that of a standard organocupric fungicide mixture. In contrast, the curative effect was significant even 10 days after inoculation.
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