Articles
Synthesis of 4 years of evaluation of natural substances in the control of apple scab with a view to reduce copper doses
Article number
1378_13
Pages
97 – 104
Language
English
Abstract
Among the pests and diseases of apple trees, the fungus Venturia inaequalis (Cooke) Winter, agent of apple scab, is one of the most dreaded.
This disease is the main phytosanitary concern of French and European apple growers.
Treatments targeting this disease represent nearly 50% of all phytosanitary applications on apple, around 15 to 20 per year.
Actually, the organic scab management strategy is based on scab resistant cultivars and fungicide treatments, in particular copper.
This substance is classified as a candidate for substitution at European level and is approved until 2025; so, it is urgent to find alternatives.
Different types of natural substances (i.e., plant extracts, beneficial microbes, mineral substances) were evaluated on apple scab, with or without added copper, for 4 years (2018 to 2021). Some substances allow to reduce and/or to replace copper, particularly on low and moderate contaminations.
Furthermore, there is variability in the effectiveness of some of these substances according to the type of organ (leaf/fruit). The use of the qPFD tool helps to identify natural substances with a defence-stimulating action and to improve their positioning in a treatment strategy.
Finally, the use of decision support tools is central to create effective strategies without copper.
This disease is the main phytosanitary concern of French and European apple growers.
Treatments targeting this disease represent nearly 50% of all phytosanitary applications on apple, around 15 to 20 per year.
Actually, the organic scab management strategy is based on scab resistant cultivars and fungicide treatments, in particular copper.
This substance is classified as a candidate for substitution at European level and is approved until 2025; so, it is urgent to find alternatives.
Different types of natural substances (i.e., plant extracts, beneficial microbes, mineral substances) were evaluated on apple scab, with or without added copper, for 4 years (2018 to 2021). Some substances allow to reduce and/or to replace copper, particularly on low and moderate contaminations.
Furthermore, there is variability in the effectiveness of some of these substances according to the type of organ (leaf/fruit). The use of the qPFD tool helps to identify natural substances with a defence-stimulating action and to improve their positioning in a treatment strategy.
Finally, the use of decision support tools is central to create effective strategies without copper.
Authors
A. Duval-Chaboussou, A. Leblois
Keywords
Venturia inaequalis, basic substances, biocontrol agents, copper, decision support tool
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