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Pear blossom blast and dieback (Pseudomonas syringae) (BIOFRUITNET Practice Abstract)

{Tool} Pear blossom blast and dieback (Pseudomonas syringae) (BIOFRUITNET Practice Abstract). Creator(s): Brouwer, Gerjan. Issuing Organisation(s): Delphy. Biofruitnet Practice Abstract, no. 058. (2023)

[thumbnail of Pear blossom blast and dieback (Pseudomonas syringae)] PDF - Published Version - English (Pear blossom blast and dieback (Pseudomonas syringae))
[thumbnail of Tak -en bloesemsterfte bij peer (Pseudomonas syringae)] PDF - Published Version - Dutch/Nederlands (Tak -en bloesemsterfte bij peer (Pseudomonas syringae))
[thumbnail of Birnenblütenbrand und -sterben (Pseudomonas syringae)] PDF - Published Version - German/Deutsch (Birnenblütenbrand und -sterben (Pseudomonas syringae))

Document available online at: https://orgprints.org/45945

Summary in the original language of the document

Less dieback of blossoms and a better yield when the bacterium is controlled.
Practical recommendation
The bacterium Pseudomonas is present on many plants including woody and herbaceous plants. Pseudomonas are epiphytic (organism that grows on the surface of a plant/tree). Epiphytic overwintering in the buds of pear is possible. If weather conditions (i.e., rainy, cold) are favourable for the bacterium, it will grow fast and cause damage. In pear, rain and low temperatures, especially frost-inducing temperatures during bloom, increase the incidence of blossom infection. Blossom petals are very susceptible.
Preventive measures
• No over-crown irrigation when not necessary,
• Over-crown irrigation only in case of frost protection, and
• Prune away infected parts.
Direct control measures
• Protect blossoms during cold weather conditions,
• Copper products, two-three sprays in spring (when allowed),
• Alternative products could be Blossom Protect (Aureobasidium pullulans), Bacillus subtilis and B. amyloliquefaciens. Some growers use a laminarin product.
Diagnosis of Pseudomonas - confusion is possible with
• Fireblight (Erwinia amylova): There is a difference in the conditions for infection: fireblight needs warm temperatures and Pseudomonas prefers rainy, cold conditions. Moreover, the first symptoms of Pseudomonas are small, black spots on the flower petals.
• Alternaria spp. (dead flower buds): Symptoms are a partial or complete necrosis of flower buds during dormancy or bud break.

EPrint Type:Practice tool
What problem does the tool address?:Pear blossom blast and dieback (Pseudomonas) is a bacterium. It can infest blossoms, shoots, and leaves. Rain and low temperatures during bloom increase blossom infection. Especially early flowering varieties are susceptible, like Xenia (Oksana/Novemberbirne), Beurré d’Anjou, Beurré Bosc and Beurré Alexander Lucas.
What solution does the tool offer?:To handle the bacterium, preventive measures are used in combination with direct measures.
Type of Practice Tool:Practice abstracts
Keywords:Disease control, pear
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
European Union > Organic Farm Knowledge
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://organic-farmknowledge.org/tool/45945, https://biofruitnet.eu
Project ID:ofk
Deposited By: Basler, Andreas
ID Code:45945
Deposited On:26 Apr 2023 07:18
Last Modified:02 May 2024 10:31
Document Language:English, German/Deutsch, Dutch/Nederlands

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