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What is special about pear scab (Venturia pirina)? (BIOFRUITNET Practice Abstract)

{Tool} What is special about pear scab (Venturia pirina)? (BIOFRUITNET Practice Abstract). Creator(s): Brouwer, Gerjan. Issuing Organisation(s): Delphy. Biofruitnet Practice Abstract, no. 006. (2022)

[thumbnail of What is special about pear scab (Venturia pirina)?] PDF - Published Version - English (What is special about pear scab (Venturia pirina)?)
[thumbnail of Quelle est la particularité de la tavelure du poirier (Venturia pirina)?] PDF - Published Version - French/Francais (Quelle est la particularité de la tavelure du poirier (Venturia pirina)?)
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Document available online at: https://orgprints.org/45144


The right knowledge and strategy will benefit growers specialised in pear, a minor crop compared to apple.
Practical recommendation
Although ascospores and conidia (twig scab) can be in the orchard, it is essential to reduce the amount of ascospores in spring. There is no specific decision support model for pear scab.
Preventive measures to reduce inoculum and the risk of infection (ascospores)
• Stimulate leaf decomposition using vinasse in autumn at leaf fall
• Reduce the amount of fallen leaves in autumn and winter by machinery for shredding or removing leaves
• Avoid overwintering leaves in neighbouring land, hedges or bushes
• Prune away shoots with twig-scab in winter
Preventive measures to reduce the risk of spore germination
• Proper pruning for an open and fast-drying tree, to prevent too long leaf wetness
• Avoid too much growth by root or stem pruning
• Proper fertilisation
• Choice of varieties. There is no resistance gene known for pear scab. Varieties with a low incidence of scab are Xenia, and Concorde. Varieties susceptible to scab are, for example Conference and Williams
• Use models to predict infections
• No overhead irrigation but drip irrigation
Direct control
• Before rain (preventive), during rain (stop-spray) or after rain (curative)
• Plant protection products: copper, sulphur, lime sulphur and bicarbonates (when allowed)

EPrint Type:Practice tool
What problem does the tool address?:Pear scab is the primary fungal disease in organic pear production affecting fruit quality and leading to significant yield losses. Contrary to apple, pear scab can also infect young shoots. From early spring conidia are spread from the scab lesions.
What solution does the tool offer?:There are effective preventive measures to reduce the risk of pear scab infection, including promoting leaf decomposition, pruning, site and variety selection, and balanced fertilisation. Plant protection products are used for direct scab control from green tip in spring and during the growing season.
Type of Practice Tool:Practice abstracts
Keywords:Diseases, Pear scab, Preventive measures, Direct control
Agrovoc keywords:
Subjects: Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
Research affiliation: European Union > Horizon 2020 > Biofruitnet
Netherlands > Other organizations
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://organic-farmknowledge.org/tool/45144, https://biofruitnet.eu, https://organic-farmknowledge.org/tool/44121, https://organic-farmknowledge.org/tool/44120
Project ID:ofk
Deposited By: Basler, Andreas
ID Code:45144
Deposited On:11 Jan 2023 12:25
Last Modified:21 Apr 2023 16:13
Document Language:English, German/Deutsch, Dutch/Nederlands, French/Francais

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