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How to deal with European canker (Neonectria ditissima) in organic orchards (BIOFRUITNET Practice Abstract)

{Tool} How to deal with European canker (Neonectria ditissima) in organic orchards (BIOFRUITNET Practice Abstract). Creator(s): Brouwer, Gerjan. Issuing Organisation(s): Delphy. Biofruitnet Practice Abstract, no. 108. (2023)

[thumbnail of How to deal with European canker (Neonectria ditissima) in organic orchards] PDF - Published Version - English (How to deal with European canker (Neonectria ditissima) in organic orchards)
[thumbnail of Vruchtboomkanker in biologische boomgaarden] PDF - Published Version - Dutch/Nederlands (Vruchtboomkanker in biologische boomgaarden)

Document available online at: https://orgprints.org/46015


Less infected parts of the tree give a healthier tree and a better yield with improved quality.
Practical recommendation
Preventive measures
• Cultivar susceptibility differs. If fruit tree canker is known to be a problem in the orchard, choose less
susceptible varieties.
• Do not plant a new plot downwind of an old plot with a lot of fruit tree canker.
• Start with healthy trees and inspect the trees in the nursery.
• The type of soil and soil conditions influence the susceptibility of the trees. Plant the trees in healthy soil with good soil life. Avoid plots that are regularly flooded.
• The growing circumstances influence the susceptibility. Avoid dense trees, limit the growth with root pruning, and use limited fertilisation. The aim is to achieve balanced tree growth.
• Young trees with stem infections should be removed.
• Cut away infected spots on the stem and prune away infected branches. Repeated canker-pruning is
necessary: in autumn/winter, pre-flowering and after flowering, until the end of June.
• Avoid unnecessary wounds such as on stems along poles or caused by thread rubbing.
Direct measures
• Cover wounds in autumn with a wound sealer. This is only effective if the cankerous wounds have been cleanly excised/milled out.
• Copper sprays in autumn (when allowed in your country). Leaves treated with copper decompose worse. Therefore, apply other measures first. Use copper only when necessary.
• Lime water (calcium hydroxide) in autumn via spraying or via overhead irrigation. Calcium hydroxide is a basic substance in Europe.

EPrint Type:Practice tool
What problem does the tool address?:The Neonectria ditissima fungus attacks trees in orchards, causing cankers and dieback of stems and young shoots, resulting in loss of fruiting wood and increased pruning costs. Fruit infections cause rot during the growing season or in storage. European canker is mainly a problem in north-western Europe's mild and humid climate (Netherlands, Belgium, northern Germany, Denmark and Scandinavian countries).
What solution does the tool offer?:Combining preventive measures and sanitation with decision support systems and direct measures can greatly reduce infestation. Breeders should look for more resistant cultivars.
Type of Practice Tool:Practice abstracts
Keywords:Disease control, apple and pear, European canker
Agrovoc keywords:
plant disease control
Subjects: Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
Research affiliation: European Union > Horizon 2020 > Biofruitnet
Netherlands > Other organizations Netherlands
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://organic-farmknowledge.org/tool/46015, https://biofruitnet.eu, https://organic-farmknowledge.org/tool/46016
Project ID:ofk
Deposited By: Basler, Andreas
ID Code:46015
Deposited On:26 Apr 2023 10:06
Last Modified:22 Aug 2023 05:44
Document Language:English, Dutch/Nederlands

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