Abstract
A rainfall simulator was used on groundnut (Arachis hypogaea) plots artificially infected withPuccinia arachidis in order to study urediniospore dispersal caused by various amounts of rainfall. Several trapping method were used to compare dry, splash and drip dispersal caused by rain. The spore liberation mechanisms activated by rain and the flows of spores which they generate can be studied at the infected canopy or at the sporulating lesion scales. Two systems referring to these scales were considered to discuss the results. Dry dispersal seemed preponderant. The spore content of the lesions in the canopy was strongly reduced by rain. The results indicated that light rain showers may promote disease dispersal, whereas it may be hampered by heavy showers. Een regensimulator, een krachtig beregeningsapparaat, werd ingezet boven een aantal aardnoot-(Arachis hypogaea) veldjes geinoculeerd met de aardnootroest (Puccinia arachidis) om de uredosporenverspreiding te bestuderen bij verschillende hoeveelheden regenval. Diverse vangtechnieken werden toegepast om droge verspreiding, spatverspreiding en druipverspreiding ten gevolge van regen te vergelijken. De sporeninhoud van de sporenhoopjes op het gewas werd door regen sterk verminderd. De resultaten, verkregen in twee verschillende, maar elkaar aanvullende analyses, geven aan dat lichte regenbuien de ziekteverspreiding bevorderen, terwijl zware buien deze zouden afremmen.
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