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Molitor D.,Center De Recherche Public Gabriel Lippmann | Behr M.,Center De Recherche Public Gabriel Lippmann | Fischer S.,Institute Viti Vinicole | Hoffmann L.,Center De Recherche Public Gabriel Lippmann | Evers D.,Center De Recherche Public Gabriel Lippmann
Journal International des Sciences de la Vigne et du Vin | Year: 2011

Aims: Leaf removal in the cluster-zone has proved to be an efficient option to reduce grey mould infestation. The aim of the present work was to determine the optimal timing of this measure in practical viticulture. Methods and results: Manual leaf removal in the cluster-zone was carried out at six time points between pre-bloom (BBCH 57) and veraison (BBCH 81) on the white varieties Sauvignon blanc (2009), Auxerrois (2009), Pinot gris (2010) and Riesling (2010). Leaf removal conducted between bloom and berries-touching led to a decreased number of interior clusters as well as a reduced cluster compactness and disease severity of B. cinerea. Prebloom and late (at veraison) leaf removal turned out to be less efficient. Conclusion: Leaf removal between bloom and berries-touching proved to be very efficient to control bunch rot due to (i) the disaggregation of the cluster structure and (ii) the improved microclimatic conditions and can be recommended in integrated as well as organic viticulture. Significance and impact of the study: The outcome of the present study constitutes an important tool for improving grape health status and, in consequence, wine quality under cool climate winegrowing conditions. © Vigne et Vin Publications Internationales (Bordeaux, France).


Evers D.,Center De Recherche Public Gabriel Lippmann | Molitor D.,Center De Recherche Public Gabriel Lippmann | Rothmeier M.,Center De Recherche Public Gabriel Lippmann | Behr M.,Center De Recherche Public Gabriel Lippmann | And 2 more authors.
Journal International des Sciences de la Vigne et du Vin | Year: 2010

Aim : The present work evaluated different strategies for the control of grey mold, caused by Botrytis cinerea, on wine grapes, including the use of the plant growth regulator Gibb3, leaf removal and/or botryticide treatments. The efficiency of the different control strategies (disease incidence and severity, yield) as well as the effect on the cluster structure was investigated. Methods and results : The trials were conducted in commercial vineyards in the Moselle Valley (Luxembourg) between the years 2007 and 2009, on the Pinot gris, Pinot blanc and Pinot noir grape varieties. The untreated control (T 1 ) was compared to the following treatments : (T2) Gibb3, (T3) Gibb3 combined with leaf removal in the cluster zone after bloom, (T4) leaf removal after bloom combined with two times botryticides and (T5) Gibb3 combined with two times botryticides. The combination of Gibb3 with leaf removal or botryticide applications led to an efficiency level in grey mold reduction of around 60% and a decrease in cluster density when compared to die control. Moreover, we showed that the progression of grey mold disease was slowed down by the three treatments T3, T4 and T5. Conclusions : Gibberellic acid applied at full bloom as stand-alone treatment did not reduce in a significant way the compactness of the grape clusters and the impact on grey mold development was low. For a significant decrease of disease severity, gibberellic acid had to be combined with an additional measure, such as leaf removal or the use of botryticides. Based on its positive effect on cluster structure and microclimate, leaf removal can be recommended as a basic measure that can be further combined with an application of botryticides or gibberellic acid. Significance and impact of the study : All the tested strategies combining two measures have shown their potential to prolong the ripening period and therewith to improve wine quality. Moreover, the combined use of gibberellic acid and leaf removal represents a sustainable strategy for integrated viticulture due to its reduced input of organic-synthetic pesticides into the environment. © Vigne et Vin Publications Internationales (Bordeaux, France).


Molitor D.,Institute Viti Vinicole | Rothmeier M.,Institute Viti Vinicole | Behr M.,Institute Viti Vinicole | Fischer S.,Center De Recherche Public Gabriel Lippmann | And 2 more authors.
Vitis - Journal of Grapevine Research | Year: 2011

The efficiency of crop cultural (leaf removal) as well as of chemical methods (plant growth regulator, botryticide) to control grey mould caused by Botrytis cinerea was investigated in two seasons (2008 and 2009) on the varieties 'Pinot blanc' and 'Pinot gris' in the Moselle valley (Luxembourg). The application of the plant growth regulator Regalis̄ (a.i. prohexadioneCa) led to a considerably more flexible cluster structure and a slight decrease of grey mould disease severity. The reduction of bunch rot infestation was of the same level than obtained by a single application of a botryticide (a.i. fenhexamid) before berries touching. Leaf removal reduced the cluster density slightly and proved to be more efficient against B. cinerea than the chemical treatments (reduction of grey mould disease severity of 57% on average). Thus, leaf removal in the cluster-zone shortly after bloom can be recommended as an important tool in integrated as well as in organic bunch rot protection strategies. The best loosening effect on the cluster structure as well as the best B. cinerea reduction efficiency (75% on average) was achieved when combining leaf removal and Regalis̄ application. The combination of leaf removal and botryticide application showed comparable results. Simulation of the B. cinerea epidemiology demonstrated that all treatments tested might allow for a longer maturation time due to lower infestation. The longest potential harvest delay until reaching an assumed threshold of 5% disease severity was achieved by combining leaf removal and application of Regalis̄ or a botryticide (on average 11.6 or 9.9 days, respectively). The here presented strategies can thus be recommended to maximize wine quality in two ways - through a reduction of fungal contamination and/or an improvement of grape maturity.

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