Available on ORBi since
10 March 2011
Doctoral thesis (Dissertations and theses)
Innovative strategies for the control of apple scab (Venturia inaequalis [Cke.] Wint.) in organic apple production
Jamar, Laurent


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Keywords :
copper; disease management; natural substance; scab resistance; apple cultivar; organic fruit; RIMpro; soil quality; tunnel sprayer
Abstract :
[en] The aim of this thesis, conducted over six growing seasons (2003-2008), is to define new measures for reducing the use of fungicides and in particular, copper fungicides, for the control of apple scab (V. inaequalis) in organic apple production. Special emphasis is put on primary scab infection control during spring season. An original approach is proposed for defining a specific spray timing involving spraying during the infection processes, especially before fungal penetration, determined by the RIMpro software warning system. This ‘during-infection’ spray strategy allows reducing from 30 to 50% the amount of fungicide usually used for effective apple scab control, on high scab-susceptible cultivars. The field study shows that six alternative products (e.g., potassium bicarbonate and lime sulphur), among 60 products tested, have the potential to reduce copper use. However, copper use, even with low doses, seems to be still necessary in presence of scab-susceptible cultivars. The results obtained in these experiments could not be attributed to the specific technical performances of the tunnel sprayer used, which however, offer valuable environmental benefits. On the basis of the present study, the organic management system seems a good farming approach for maintaining soil quality with regard to biological indicators. This work shows and draws attention to the fact that (i) planting cultivars with polygenic scab-resistance traits, (ii) increasing emphasis on sanitation practices aimed at reducing initial inoculum in autumn, and (iii) applying an accurate spray strategy in spring, as defined in the present study, are the three most promising approaches for substantial further reductions in protection products fully compliant with international organic crop production standards.
Research center :
Centre wallon de recherches agronomique
Disciplines :
Agriculture & agronomy
Author, co-author :
Jamar, Laurent ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Language :
Title :
Innovative strategies for the control of apple scab (Venturia inaequalis [Cke.] Wint.) in organic apple production
Alternative titles :
[en] Stratégies innovantes de protection vis-à-vis de la tavelure du pommier (Venturia inaequalis [Cke.] Wint.) en production biologique.
Defense date :
25 March 2011
Number of pages :
Institution :
ULiège - Université de Liège
Degree :
Promotor :
Lepoivre, Philippe ;  Université de Liège - ULiège > Département GxABT > Gestion durable des bio-agresseurs
Lateur, Marc
President :
Baudoin, Jean-Pierre ;  Université de Liège - ULiège > Département GxABT > Plant Sciences
Jury member :
Magein, Hugo ;  Université de Liège - ULiège > Département GxABT > Plant Sciences
Jijakli, Haissam ;  Université de Liège - ULiège > Département GxABT > Gestion durable des bio-agresseurs
Parisi, Luciana
Name of the research project :
Recherche méthodologique en vue d'établir une protection phytosanitaire optimale de vergers de pommiers conduits suivant le mode de production biologique
Funders :
DGA - Région wallonne. Direction générale de l'Agriculture


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