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Apple scab (Venturia inaequalis): Direct control using decision support systems

Boutry, Clémence; Ludwig, Mathias and Schärer, Hans-Jakob (2022) Apple scab (Venturia inaequalis): Direct control using decision support systems. Biofruitnet Practice Abstract. Research Institute of Organic Agriculture FiBL, CH-Frick .

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Summary

Practical recommendation
Apple scab sprayings
• Preventive treatment prior to infection period: The freshly germinating ascospores are very susceptible to contact fungicide, so a preventive treatment can be implemented prior to spore ejection (Fig. 1, A).
o Until balloon stage (BBCH 59): copper (150-300 g pure copper/ha*) or copper + wettable sulfur (exchange sulphur with a wetting agent when the temperature is low2); reduce the amount of copper as you get closer to the pre-bloom (risk of russeting).
o From balloon stage (BBCH 59) to walnut stage (BBCH 74)1: acidified clay mineral (8 kg/ha*) + wettable sulfur (8-12 kg/ha prior to full bloom BBCH 65, 3-8 kg/ha after full bloom, choose lower dosage if high temperatures*), or only wettable sulfur if acidified clay mineral is not allowed in your country*.
o From walnut stage on (BBCH 74): continue with acidified clay mineral + wettable sulfur*, or switch to copper (+ sulfur)*.
• Stop-treatment onto wet foliage: The amount of germinating ascospores over time is indicated by the white area behind the yellow bar (Fig. 1, 7). Within this time, a stop treatment can be used to kill the spores (Fig. 1, B).
o lime sulfur (25.6 l/ha prior to full Bloom, 19.2 l/ha after full bloom*) or
o potassium bicarbonate (4.8 kg/ha*) + wettable sulfur (8-12 kg/ha prior to full bloom BBCH 65, 3-8 kg/ha after full bloom, choose lower dosage if high temperatures2*)


EPrint Type:Report
Keywords:Temperate fruits, plant disease control, plant protection, apples, Biofruitnet, Abacus, FiBL2507304
Agrovoc keywords:
Language
Value
URI
English
plant disease control
http://aims.fao.org/aos/agrovoc/c_5960
English
temperate fruits
http://aims.fao.org/aos/agrovoc/c_7655
English
plant protection
http://aims.fao.org/aos/agrovoc/c_5978
English
apples
http://aims.fao.org/aos/agrovoc/c_541
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 > Crop protection
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Special crops > Fruit
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://orgprints.org/44111
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:45633
Deposited On:03 Mar 2023 10:04
Last Modified:03 Mar 2023 10:04
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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