Abstract
A new sweet potato disease was discovered in Ethiopia. The disease mainly affects the stems and petioles of sweet potato and the name sweet potato stem blight is proposed. The pathogen is a species ofAlternaria, for which no definite name has been found so far.
Sweet potatoes were most susceptible, tomatoes were slightly susceptible, and muskmelons and chilli peppers were resistant. Thorn apples and onions showed slight to moderate symptoms, butAlternaria was not reisolated from these two species. Although all sweet potato varieties tested were susceptible, there were significant differences in sensitivity.
Samenvatting
In 1977 werd een nieuwe ziekte ontdekt in zoete bataat in Ethiopië. De ziekte wordt gekenmerkt door zwarte necrotische lesies, voornamelijk op de stengels en bladstelen. Deze lesies breiden zich uit totdat de stengels en bladstelen omringd worden en de bovenliggende weefsels afsterven. De naam stengelnecrose wordt voorgesteld.
De ziekte wordt veroorzaakt door eenAlternaria soort, waarvoor nog geen definitieve naam gevonden is. Het zou een nog onbeschreven soort kunnen zijn. Zoete bataat was het meest vatbaar, tomaat matig vatbaar, en netmeloen en spaanse peper waren resistent. Doornappel en ui vertoonden wel symptomen, maarAlternaria sp. kon niet uit het zieke weefsel worden geïsoleerd. Hoewel geen van de getoetste zoete bataatvariëteiten onvatbaar waren, waren er significante verschillen in gevoeligheid.
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FAO associate expert in plant pathology from 1976 to 1980, stationed at the Institute of Agricultural Research, Nazareth, Ethiopia.
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Van Bruggen, A.H.C. Sweet potato stem blight caused by Alternaria sp.: A new disease in Ethiopia. Netherlands Journal of Plant Pathology 90, 155–164 (1984). https://doi.org/10.1007/BF02006479
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DOI: https://doi.org/10.1007/BF02006479