Innovative strategies for the control of apple scab (Venturia inaequalis [Cke.] Wint.) in organic apple production
Type de document
thesis
Langue source
Anglais
Titre français
Stratégies innovantes de lutte contre la tavelure du pommier (Venturia inaequalis [Cke.] Wint.) Dans la production biologique de pommes
Titre anglais
Innovative strategies for the control of apple scab (Venturia inaequalis [Cke.] Wint.) in organic apple production
Auteur(s)
- JAMAR L.
Editeur(s)
Autre(s)
Id
UTC36I3Y
Version
3218
Date ajout
20 novembre 2020 17:51
Date modification
12 avril 2021 15:49
Résumé
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 scabresistance
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.
Note
None
CRAW tags
- AB - Spécifique
- CRA-W
- FREDO lutte
- GEO Belgique
- GEO Wallonie
- champignon
- cuivre
- fungicide
- maladie
- pomme
- tavelure
- verger
WEB tags
Date caractères
2011
Date publication
1 janvier 2011