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Strategy to control Peach Leaf Curl damage (BIOFRUITNET Practice Abstract)

{Tool} Strategy to control Peach Leaf Curl damage (BIOFRUITNET Practice Abstract). Creator(s): Vávra, Radek; Kaplan, Jiří; Falta, Vladan and Maryška, Lukáš. Issuing Organisation(s): VSUO - Research and Breeding Institute of Pomology Holovousy. Biofruitnet Practice Abstract, no. 069. (2023)

[thumbnail of Strategy to control Peach Leaf Curl damage] PDF - Published Version - English (Strategy to control Peach Leaf Curl damage)
[thumbnail of Strategie ochrany proti poškození kadeřavostí broskvoně] PDF - Published Version - Czech/Česky (Strategie ochrany proti poškození kadeřavostí broskvoně)

Document available online at: https://orgprints.org/45930


Growing varieties tolerant to leaf peach curl disease lowers copper usage and improves fruit growing and economic return.
Practical recommendations and information
• HOST PLANTS: peaches and nectarines
o On leaves: symptoms appear about two weeks after leaves emerge from buds, deformations, blisters, thickened curling leaves, and white, yellow to red leave discolorations (Pictures 1 and 2); affected leaves may dry up and fall off
o On fruits: Blistered fruit tissue, later wrinkling
o Infections on fruits make the surface corky and cracked, and affected fruits fall off
o When trees are severely affected, the disease can strongly reduce yield and fruit quality
o If significant premature leaf drop occurs, trees will be susceptible to drought stress and winter injury
o The fungus overwinters in bark and bud scales
o The infection of buds happens in early spring during bud swelling (Picture 3)
o When temperatures reach above 10°C, infections are possible as early as January
o Humid weather promotes the growth and spread of the disease
o Additional spores form on the surface of diseased tissue, and these spores cause new infections if the weather remains mild and wet
o PREVENTIVE MEASURES: Thin out and remove infested shoots by mid-May, thin fruit if the crop load is heavy, and apply copper in the fall after leaf drop
o DIRECT MEASURES: From bud swell to bud break during humid weather and temperatures above 10-12°C treat with copper; in case of persistent humid weather, repeat the treatment 1-2 weeks later
• Check records of growing degree hours +7°C (sums of active temperatures about 7°C; SAT+7) from the beginning of the year (from January 1st) at meteo-stations in or near your orchards
• The first movements of the bud scales are visible when the SAT+7 reaches the value of 800
• Ordinarily, the first treatment by copper is recommended at the value of 1100-1200 SAT+7, but it is advisable to start mostly already at the value of 1000 SAT+7 (in central Europe)
• Grow tolerant varieties to leaf peach curl disease, however fully resistant varieties do not exist
• Varieties described as the most tolerant: Bella di Roma, Catherine Sel.1, Golden Jubilee, Redhaven, Hardired, Filip, Frumoasa litoralului, Stark Saturn, Creola.; Peach varieties: Bénédicte, Belle de Montélimar and Reine des Vergers are traditional in France
• Nowadays, the offer of peach varieties is large, but the lack of reliable data concerning their suitability to organic systems makes the choice difficult

EPrint Type:Practice tool
What problem does the tool address?:Peach leaf curl is a common disease of peach and nectarine trees caused by the fungus Taphrina deformans. Severely affected trees reduce tree vigour, fruit quality and yield.
What solution does the tool offer?:Generally, early treatment with copper from bud swell to bud break during humid weather and temperatures above 10-12°C is effective. A second spray 1-2 weeks later is recommended before green leaf tips are first visible as flower buds begin to swell.
Country:Czech Republic
Type of Practice Tool:Practice abstracts
Keywords:Resistance, fruit quality
Agrovoc keywords:
disease resistance
fruit quality
Subjects: Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
Research affiliation: European Union > Horizon 2020 > Biofruitnet
Czech Republic > Other institutions Czech republic
Horizon Europe or H2020 Grant Agreement Number:862850
Related Links:https://organic-farmknowledge.org/tool/45930, https://biofruitnet.eu
Project ID:ofk
Deposited By: Basler, Andreas
ID Code:45930
Deposited On:26 Apr 2023 09:44
Last Modified:27 Apr 2023 11:22
Document Language:English, Czech/Česky

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