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Apple scab (Venturia inaequalis): Control strategy for organic pome production (Biofruitnet Practice Abstract)

{Tool} Apple scab (Venturia inaequalis): Control strategy for organic pome production (Biofruitnet Practice Abstract). Creator(s): Mora Vargas, Alfredo and Kelderer, Markus. Issuing Organisation(s): Laimburg Research Centre. Biofruitnet practice abstracts, no. 001. (2022)

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Document available online at: https://orgprints.org/44121

Summary in the original language of the document

Combining robust and resistant varieties with the proper agronomic practices and forecasting methods to optimise treatments reduces the need for biological plant protection.
Practical recommendations
Precautionary measures
• Use resistant varieties, e.g., Topaz, Inored story, GoldRush.
• Use sanitary measures, e.g., rake up fallen leaves in late autumn and shred them with a mulcher to promote leaf degradation.
• Use forecasting models to estimate ascospore flight and calculation of degree-hour.
• Use drip irrigation systems; if overhead irrigation is used, avoid plants to remain wet for more than eight hours.
• Set up the tree structure open to light and with limited vegetative development.
Direct control
Preventive control
• Preventive treatment should be carried out immediately before the onset of rainfall.
• For susceptible varieties, it is always recommended to cover all rainfall from the red bud stage until full flowering.
• In case of strong spore propagation, treat with sulphur or copper. Alternating copper and calcium polysulphide application increases the risk of fruit russeting even with non-susceptible varieties. After flowering, continue treatments with calcium polysulphide as it is less phytotoxic.
Early control (Scab stop)
• Treatment is carried out during the spore germination phase on wet leaves.
• Calculate treatment based on forecasting models (e.g., RimPro) or calculating degree hours (average temperature from the start of rainfall by the hours of wetting).
• Use 250-degree hours for early intervention. Repeat treatment if rainfall occurs.
• Calcium polysulphide is the most effective product. Use the same dosages as for preventive control. Alternatively, use bicarbonates in combination with wettable sulphur.
• Copper-based products are not recommended because of their phytotoxic effects on the leaves and fruit.

EPrint Type:Practice tool
What problem does the tool address?:Apple scab is the primary fungal disease in apple cultivation affecting entire harvests as well as the following year's production (Picture A-C). The damage can occur both in the plant and during storage.
What solution does the tool offer?:In organic farming, scab control is mostly carried out using precautionary measures. Plant protection products are used for direct control before the onset of rain and during spore germination as "scab stop".
Type of Practice Tool:Practice abstracts
Keywords:Apple scab, precautionary measures, direct control, preventive control, scab stop, sanitary measures, resistant varieties, apples, temperate fruits, pest control, disease control
Agrovoc keywords:
temperate fruits
pest control
plant disease control
Subjects: Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
Research affiliation: European Union > Horizon 2020 > Biofruitnet
Italy > Laimburg Research Centre for Agriculture and Forestry of BZ Province
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://organic-farmknowledge.org/tool/44121, https://biofruitnet.eu, https://twitter.com/farm_knowledge/status/1536607370050162690, https://www.facebook.com/organicfarmknowledge/posts/515133060399333
Project ID:ofk
Deposited By: Basler, Andreas
ID Code:44121
Deposited On:02 Jun 2022 13:55
Last Modified:15 Apr 2024 09:59
Document Language:English, German/Deutsch, Italian/Italiano, Polish/Polski

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