![]() ![]() ![]() It begins as a sappy golden liquid and hardens to form an amber deposit. A further diagnostic symptom often embodies itself as pools of gum exudate along wounds and leaf cross veins. These spots begin as distinguishable moist, brown lesions normally restricted to the bottom of the plant until they enlarge and coalesce, often killing the entire leaf. axonopodis infection is angular necrotic spotting of the leaves, often with a chlorotic ring encircling the spots. A more diagnostic symptom visible in cassava with X. Symptoms include blight, wilting, dieback, and vascular necrosis. In cassava, symptoms vary in a manner that is unique to this pathogen. Consisting of about 100 species, the most economically significant species is easily the widely cultivated woody shrub, Manihot esculenta, known colloquially as the cassava plant. manihotis is capable of infecting most members of the plant genus Manihot. Among diseases which afflict cassava worldwide, bacterial blight causes the largest losses in terms of yield. Originally discovered in Brazil in 1912, the disease has followed cultivation of cassava across the world. ![]() manihotis is the pathogen that causes bacterial blight of cassava. Aufgrund der hohen Interaktion mit der Umwelt und der Toleranzreaktion einiger Linien sind eine Ertragsverlustvorhersage und die Festlegung einer Schadensschwelle kaum möglich.Xanthomonas axonopodis pv. Bei Kombination von Befalls-und Ertragsdaten erwiesen sich sieben Linien (TMS92/0057, TMS29/0326, Cameroon, TMS92/0343, Ben86052, Lagos, Gbazékouté) als tolerant. Nach Symptomevaluierung waren vier Linien (CVTM4, Main27, TMS30572, TMS92/0429) in wenigstens einer Umgebung résistent und moderat résistent in den anderen Umgebungen, während drei Linien (Lagos, Toma289, Toma378) in jeder Umgebung anfällig waren. zweiten Versuchsjahr war die Bakterienbrandstärke negativ mit dem Ertrag korreliert. In künstlich inokulierten Versuchsfeldern in der Waldzone in zwei Jahren, und in natürlich infizierten Pflanzen in der Wald-Savannen-Übergangszone und der Feuchtsavannenzone im ersten bzw. Obwohl wegen hoher Sorte-Umwelt-Interaktionen keine Linie mit Resistenz in allen Ökozonen gefunden wurde, konnten Genotypen mit einem vielversprechenden Toleranzlevel identifiziert werden. manihotis, dem Erreger des Bakterienbrandes, wurde unter Feldbedingungen in drei Ökozonen, der Waldzone, der Wald-Savannen-Übergangszone, und der Feuchtsavanne von Togo evaluiert. Die Interaktion von 22 Manioklinien mit Xanthomonas axonopodL. Due to high interaction with the environment and tolerance reactions of some genotypes, a prediction of yield loss due to bacterial blight and the determination of a threshhold for loss seems hardly possible. Combining symptom and yield data, seven genotypes (TMS92/0057, TMS29/0326, Cameroon, TMS92/0343, Ben86052, Lagos, Gbazékouté) were identified as tolerant. Evaluating symptom development, four genotypes (CVTM4, Main27, TMS30572, TMS92/0429) were resistant in at least one environment and moderately resistant in other environments, while three genotypes (Lagos, Toma289, Toma378) were over all susceptible. Cassava bacterial blight severity was negatively correlated to cassava root yield in artificially inoculated plots in the forest zone in two years, and in non-inoculated plots in the forest savanna transition zone and the wet savanna zone in the first and the second year, respectively. Although no genotype with disease resistance in all sites was found due to high genotype x environment interactions, genotypes with promising levels of tolerance were identified. manihotis, the causal agent of bacterial blight, was evaluated under field conditions in three different sites, in the forest, forest savanna transition and wet savanna zones of Togo. The interaction of twenty-two cassava genotypes with Xanthomonas axonopodis pv. ![]()
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