Diagnostic phytopathologique des dépérissements de cerisier (Prunus avium) et prunier (Prunus domestica)

Abstract : The decline of Prunus in arboreal experimental unit at Bourran has remarkably increased in the last years. The causes of numerous expressed symptoms are unknown. The aim of this study is to make a rapprochement between the phytosanitary status of the orchards and the possible causes of dieback. We have followed the status of four genetic resources plots: one plot of plum (Prunus domestica) and three of sweet cherry (Prunus avium). Two hypotheses have been made i) the origin of the diebacks is abiotic, ii) the origin of the diebacks is parasitic. A diagnostic procedure has been adopted in order to verify these assumptions, starting by a visual observation followed by a detection analysis in the laboratory. The zones of diebacks are localized by juxtaposing the location of symptoms in plan of each parcel. Most of the diebacks areas correspond to the wetter parts of the plots, and to the most sunexposed plots. These factors suggest that the majority of the decline symptoms are abiotic.The bacterial genera Pseudomonas and Xanthomonas were not detected in the samples analyzed. Fungal analyzes showed a majority presence of saprophytic fungi that can become secondary pests. The fungus Phoma macrostoma recognized as apple pathogen was isolated from two samples of cherry; however it has not been reported on cherry or on other species of Prunus. This result encourages us to perform other advanced analyzes to determine the impact and effect of Phoma macrostoma on Prunus species especially cherry.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2015_MENAD_OMAR.pdf
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Omar Menad. Diagnostic phytopathologique des dépérissements de cerisier (Prunus avium) et prunier (Prunus domestica). Microbiologie et Parasitologie. 2015. ⟨hal-01834431⟩

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