| Sumario: | Irish potato crops in certain high altinde places of Ecuador we beavily infected by Puccinia Pittieriana, destroying completely the plants. In order to determine its che-mical control, a field experiment was made at Tufiño, Carchi province, to evalua e eight fungicides and one insecticide. Treatments were made at two week intervals using bigh galonage spraying Results were periodically measured in terms of number of pustules on the leaves. Organic fungicides were the best to control the sust disease, as this happened with Zimate, Phaltan, Thylate and Manzate The group formed by Fermate, Cupravit, and Wettable Sulfm were less effective than the first group Lead avenare and Ditox-75 insecticide were similar to the untreated plots.
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