Abstract
The development of sorghum anthracnose symptoms was monitored on 17 sorghum genotypes of diverse origins during two rainy seasons in the savanna of Nigeria. Four symptoms of the disease were clearly revealed by the sorghum differentials. The development of these symptoms was best studied in the local and exotic genotypes ‘Warwarabashi’ and ‘IS 18442’, respectively. The symptoms, which appeared in sequence and marked the different phases of the disease, include chlorotic flecks on leaves, necrotic spots on leaf lamina, leaf sheath lesion, midrib infection and panicle infection. Resistant genotypes produced only chlorotic flecks without acervuli, moderately resistant genotypes produced necrotic spots on the leaf lamina without noticeable acervuli while the susceptible genotypes had midrib and leaf lamina infections, which are the most severe symptoms accompanied by proliferous acervuli. The relationships of different phases are also discussed.
Zusammenfassung
Die Entwicklung von Anthraknosesymptomen an 17 Hirse-Genotypen unterschiedlicher Herkunft wurde wahrend zweier Regenperioden in der nigerianischen Savanne untersucht. Vier Krankheitssymptome konnten durch das Hirse-Testsortiment deutlich festgelegt werden. Als besonders geeignet fur die Untersuchung der Entwicklung der Symptome erwiesen sich die lokale Sorte ‘Warwarabashi’ und der exotische Genotyp ‘Is 18442’. Folgende Symptome, die in Folge erschienen und die verschiedenen Phasen der Krankheit darstellten, wurden beobachtet: chlorotische Flecken auf den Blättern, nekrotische Flecken auf den Blattflächen, Schäden an den Blattscheiden, Infektionen an den Mittelrippen und Rispen. An resistenten Genotypen bildeten sich nur chlorotische Flecken ohne Acervuli, mäßig resistente Genotypen produzierten nekrotische Flecken auf der Blattfläche ohne wahrnehmbare Acervuli, während sich an anfälligen Genotypen starke Befallssymptome und reichlich Acervuli auf den Mittelrippen und Blattflächen entwickelten. Die Beziehungen zwischen den verschiedenen Phasen der Krankheit werden diskutiert.
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Gwary, D.M., Rabo, T.D. & Anaso, A.B. The development of anthracnose symptoms on sorghum genotypes in the Nigerian savanna. J Plant Dis Prot 111, 96–103 (2004). https://doi.org/10.1007/BF03356136
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DOI: https://doi.org/10.1007/BF03356136