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Contribution à la lutte contre les maladies
du bois de la vigne, en particulier l'esca

Abstract : Esca is a fungal syndrom found in the grapevine (Vitis vinifera) vascular system. During an initial phase, Phaeoacremonium aleophilum (PA), Phaeomoniella chlamydospora (PC) and, sometimes, Eutypa lata (EL) develop then allowing a latter infection from other fungal species. The recent banning of sodium arsenite left this syndrom out of control.
Our work deal with PA, PC and EL properties, and also on the impact of natural molecules and commercial fungicides on the growth of these fungi. These pathogens exhibited different responses to these treatments and one of them (PA) was poorly or not affected. In parallel, we studied the ambimobility properties of salicylic acid (SA) and some of its halogenated derivatives.
Our results showed that F 30 (an acidic derivative of fenpiclonil) was mobile into grape cuttings after a foliar treatment. F 30 was partially trapped in the wood and metabolized back to its parent molecule in the root system. 5-Chlorosalicylic acid (5-ClSA) which is known to be more active than SA on plant defense stimulation exhibited a similar phloem mobility. Therefore, F 30 and 5-ClSA have been selected for testing foliar treatments on infected grape cuttings.
Such exploratoring research underline the complexity of the subject studied. Chemical treatments (fungicide) which generate several constraining elements, may be included in a wider strategy of disease control.
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Submitted on : Tuesday, November 6, 2007 - 6:00:09 PM
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Cyril Jousse. Contribution à la lutte contre les maladies
du bois de la vigne, en particulier l'esca. Physiologie [q-bio.TO]. Université de Poitiers, 2006. Français. ⟨tel-00185265⟩

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