Apple scab (Venturia inaequalis): Robust cultivars for Central Europe
PRACTICE ABSTRACT
Apple scab (Venturia inaequalis): Robust cultivars for Central Europe. Fördergemeinschaft Ökologischer Obstbau e.V. (FÖKO).
Practice Abstract
Apple scab (Venturia inaequalis): Robust cultivars
for Central Europe
Problem
Apple scab (V. inaequalis) is the main disease in organic
apple production. Availability of varieties is a major prob-
lem as only a few robust varieties are available on the
market.
Solution
We propose a list of currently well-known robust varieties
that are suitable for large scale production. Current
breeding of new cultivars is crucial for the future of or-
ganic growing, stay tuned.
Benefits
Using robust cultivars reduces the need for external and
high cost inputs, reduces the workload on farmers (less
applications are needed) and enhances the sustainability
of the fruit production.
Practical recommendations
• The choice of scab resistant/tolerant varieties depends on the climatic and site related conditions as well as
the farm-specific marketing requirements. Discuss with farmer colleagues and the regional or national con-
sulting services for organic fruit growing about the best scab resistant/tolerant varieties in your area.
• Check the FiBL list of varieties for organic cultivation for an overview on available cultivars and some of their
production characteristics in the link section.
• The most common scab-tolerant cultivars in central Europe are:
Story/Inored, Topaz, Opal, Ladina, Santana, Antonovka and Idared.
• Resistant varieties do not overcome apple scab completely. Treatments with plant protection products are
still needed but choosing the right variety significantly reduces dependency on external inputs. (Figure 1)
Applicability box
Theme
Crop production, Horticulture, Temperate Fruits
Keywords
Plant protection, apple, apple scab
Context
Central Europe
Application time
During planting season (Nov-Apr) and any time plan-
ning is possible
Period of impact
5 years until new orchards comes into full yield
Best in
Organic farms
PRACTICE ABSTRACT
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 862850. This
communication only reflects the author’s view. The Research Executive Agency is not responsible for any use that may be made of the information pro-
vided. The authors and editors do not assume responsibility or liability for any possible factual inaccuracies or damage resulting from the application of the
recommendations in this practice abstract.
Figure 1: Plant protection products application rates and percentage of plants free of infestation in scab-resistant varieties compared to
non-scab resistant varieties. The data shows farms with both resistant and non-resistant varieties in Germany in 2018. Means=30 out of
34 farms evaluated (see links below).
A. Ratio of plant protection products sprayed in scab resistant and non-scab resistant varieties (Input). The input of pure copper for the scab-
resistant varieties in 2018 decreased to about 80% of the application rate used for the non-resistant varieties. A similar reduction is shown
for sulphur. Complete elimination of direct regulatory measures was not possible with the scab-resistant varieties. However, the input of
fungicides is significantly reduced, and, relatively, the number of sprays was little reduced.
B. Percentage of infestation-free (infested fruit < 5%) plants in scab resistant and non-scab resistant varieties (Output). Fruit scab infestation
in resistant varieties is reduced about 1/3 when compared to non-resistant varieties. A significant reduction of infestation is shown also for
Russeting while no significant changes were recorded for Soothy blotch.
Further information
Weblinks
• Varieties recommended for organic fruit growing in the FiBL shop (in German and French).
• Article on keeping plants healthy in organic apple production from FÖKO (in German).
• Check the Organic Farm Knowledge platform for more practical recommendations.
About this practice abstract
Publisher(s):
Fördergemeinschaft Ökologischer Obstbau e.V. (FÖKO)
Traubenplatz 5, D-74189 Weinsberg
foeko@foeko.de, [http://www.foeko.de/ www.foeko.de
]Author: Niklas Oeser
Contact: niklas.oeser@esteburg.de Review: Ambra De Simone (IFOAM EU), Lauren Dietemann (FiBL)
Permalink: Organic-farmknowledge.org/tool/44114
Project name: BIOFRUITNET- Boosting Innovation in ORGANIC FRUIT
production through stronger networks
Project website: www.biofruitnet.eu
© 2022
Original source: https://biofruitnet.eu/wp-content/uploads/2022/06/4-PA_Scab_resistant-Varieties_Approved-1.pdf