Abstract
Abstract The effect of planting stem cuttings infected with Plenodomus destruens on the stand, the varietal disease resistance, the effect of the position of the cutting on the vine as related to disease incidence, and a fungicide screening for stem‐cutting treatment were studied at EMBRAPA/CNPH, Brasilia, Brazil, in order to obtain information to establish management measures to control foot rot of sweet potatoes. When symptomless infected cuttings were utilized the stand had a seven‐fold reduction as compared to disease‐free cuttings. Among the five sweet potato cultivars released by EMBRAPA, ‘Brazlandia Branca’ was very susceptible to foot rot, whereas ‘Princesa’ showed the same level of resistance as ‘Morada INTA’, an Argentinian cultivar used as a resistant control. Stem cuttings from the younger extremity of the vine yielded significantly less diseased plants than cuttings taken from lower sections of the vine. Among seven fungicides tested for stem‐cutting disinfection, thiabendazole was the most effective, followed by PCNB, benomyl, iprodione, and captan. Chlorothalonil and mancozeb did not differ from the non‐treated control. These results are discussed in view of other management measures to control foot rot.
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