1. Causal Agents of Powdery Mildew of Cucurbits in Sudan
- Author
-
Marc Bardin, Philippe C. Nicot, Michel Pitrat, Y. F. Mohamed, University of Gezira, Unité de Pathologie Végétale (PV), Institut National de la Recherche Agronomique (INRA), and Station d'amélioration des plantes maraîchères
- Subjects
0106 biological sciences ,Erysiphe cichoracearum ,POTIRON ,Veterinary medicine ,Citrullus lanatus ,Melon ,Leveillula taurica ,Plant Science ,01 natural sciences ,ERYSIPHE CICHORACEARUM ,03 medical and health sciences ,COURGETTE ,parasitic diseases ,[SDV.MP.MYC]Life Sciences [q-bio]/Microbiology and Parasitology/Mycology ,030304 developmental biology ,0303 health sciences ,biology ,food and beverages ,biology.organism_classification ,[SDV.BV.PEP]Life Sciences [q-bio]/Vegetal Biology/Phytopathology and phytopharmacy ,PASTEQUE ,Agronomy ,COURGE MUSQUEE ,REPARTITION GEOGRAPHIQUE ,Agronomy and Crop Science ,Sphaerotheca ,Cucurbitaceae ,Powdery mildew ,010606 plant biology & botany ,Squash - Abstract
International audience; In a survey of cucurbit crops in Sudan, 234 samples of melon, cucumber, and squash showing symptoms of powdery mildew were infected with Sphaerotheca fuliginea, while Erysiphe cichor-acearum was only observed on two samples of watermelon showing mild symptoms. Ieeveillula taurica was not observed on any sample. Field trials with differential lines of melon revealed the presence of race 1 of S. fuliginea in Gezira (Central Sudan) in the summer of 1993, and race 2 in the following winter. Virulence tests in controlled conditions on a limited number of isolates suggest that a shift in prevalence of those races may have occurred on that site over time. The geographic scale of this shift was probably limited as race 0 was observed in late autumn in northeast Sudan in the Gash Delta.
- Published
- 1995