Abstract
Post-harvest application of several chemicals, including captan, sodium hypochlorite, chlorine dioxide, triphenyl tin hydroxide, captafol, and iprodione signficantly (P=0.05) reduced infection of potato tubers (cv Norchip) byAlternaria solani. Application rates of 5.4 or 8.3 1 of chemical mixture/metric ton were effective although limited evidence indicated that the higher rate may provide additional control. Post-harvest treatments appeared to be effective when disease pressure, as measured by the numbers of lesions per tuber, was low to moderate and seemed to lose effectiveness when disease pressure was high. It is suggested that routine post-harvest applications of effective chemicals coupled with proper storage management in disease prone locations might be an economically feasible way to control early blight losses in storage.
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