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Direct control of sooty blotch in organic pome fruit production (BIOFRUITNET Practice Abstract)

{Tool} Direct control of sooty blotch in organic pome fruit production (BIOFRUITNET Practice Abstract). Creator(s): Baumgartner, Fabian and Boutry, Clémence. Issuing Organisation(s): FiBL - Research Institute of Organic Agriculture. Biofruitnet Practice Abstract, no. 049. (2023)

[thumbnail of Direct control of sooty blotch in organic pome fruit production] PDF - Published Version - English (Direct control of sooty blotch in organic pome fruit production)
[thumbnail of Direkte Bekämpfung der Regenfleckenkrankheit im ökologischen Kernobstbau] PDF - Published Version - German/Deutsch (Direkte Bekämpfung der Regenfleckenkrankheit im ökologischen Kernobstbau)
[thumbnail of Contrôle direct de la maladie de la suie dans la production biologique de fruits à pépins] PDF - Published Version - French/Francais (Contrôle direct de la maladie de la suie dans la production biologique de fruits à pépins)

Document available online at: https://orgprints.org/45942


The use of organic fungicides to reduce infestations of sooty blotch can be combined with standard crop protection. In addition, the use of these agents also has an effect against other diseases.
Practical recommendations
• The pathogen agents change from region to region, and during the season, the most common agents are: Cladosporium sp., Alternaria sp., Schizothyrium sp., Aureobasidium sp., Phoma sp., Fusarium sp., Peltaster sp., Botrytis sp., Penicillium sp., Epicoccum sp., Gloeodes pomigena, Geastrumia sp., Stomiopeltis sp., etc.
• The pathogens responsible for sooty blotch overwinter in the orchard on branch tips, bark crevices, dead wood and mummified fruits.
• Young fruits can be infected by the fungi very early after flowering, but the first symptoms appear only during July.
Time of application and strategies
• Because the pathogens of sooty blotch disease can infect the apples throughout the growing season, repeated treatments are necessary during the growing season.
• Especially in orchards with increased infestation pressure and in years with wet weather conditions, early and regular treatments are essential to regulate the rain spot with biological preparations.
• For a sufficient effect, treatments must be started in June at the latest, before the first symptoms appear.
• Treatments against sooty blotch are often combined with applications against other diseases. Most products used in the primary season against scab have a positive side effect for controlling sooty blotch (see: Plant protection products).
Plant protection products
• Products based on potassium bicarbonate have good efficacy against sooty blotch. It has been shown that unformulated carbonates do not match the effectiveness of formulated products. Adding wettable sulfur can improve the effect of potassium bicarbonates.
• Preparations with copper or lime sulfur also have some effect.
• The sole application of wettable sulfur or acidified clay mineral preparations do not have a sufficient effect.
• Until June: Potassium bicarbonate (4-5 kg/ha) and wettable sulphur1 (2-4 kg/ha), which are used to control apple scab, also have a good effect against sooty blotch.
• June to harvest: strategy can be continued against sooty blotch in humid phases, whereby the amount of sulphur1 must be adjusted to the temperatures.

EPrint Type:Practice tool
What problem does the tool address?:Sooty blotch is a complex of various epiphytic fungi that leave a more or less extensive blackish film, sticky to the touch on fruits and leaves. The consequences are that the fruits can no longer be marketed as table fruits, and the infested leaves’ photosynthesis is impaired.
What solution does the tool offer?:Organic fungicides can be used to achieve partial efficacy against sooty blotch. The success of the application is highly dependent on the weather, variety selection, infestation pressure and indirect measures taken.
Type of Practice Tool:Practice abstracts
Keywords:Plant disease control, plant protection, apple
Agrovoc keywords:
plant disease control
plant protection
Subjects: Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
Research affiliation: European Union > Horizon 2020 > Biofruitnet
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Special crops > Fruit
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://organic-farmknowledge.org/tool/45942, https://biofruitnet.eu, https://organic-farmknowledge.org/tool/45926
Project ID:ofk
Deposited By: Basler, Andreas
ID Code:45942
Deposited On:25 Apr 2023 15:23
Last Modified:28 Apr 2023 08:31
Document Language:English, German/Deutsch, French/Francais

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