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A during-infection spray strategy using sulphur compounds, copper, silicon and a new formulation of potassium bicarbonate for primary scab control in organic apple production

Jamar, Laurent; Lefrancq, Bruno; Fassotte, Christianne and Lateur, Marc (2008) A during-infection spray strategy using sulphur compounds, copper, silicon and a new formulation of potassium bicarbonate for primary scab control in organic apple production. European Journal of Plant Pathology, 122 (4), pp. 481-493.

[thumbnail of Jamar_EJPP_122_2008_481-493.pdf] PDF - Published Version - English

Document available online at: https://www.researchgate.net/publication/225204393_A_during-infection_spray_strategy_using_sulphur_compounds_copper_silicon_and_a_new_formulation_of_potassium_bicarbonate_for_primary_scab_control_in_organic_apple_production


In a field experiment conducted over two growing seasons, the effectiveness and phytotoxicity of inorganic fungicides such as sulphur, lime sulphur, copper, silicon and Armicarb (a new formulation of potassium bicarbonate) was compared with water for the control of primary apple scab infections in Belgium on high, medium and low scab-susceptible cultivars (cvs ‘Pinova’, ‘Pirouette’ and ‘Reinette des Capucins’, respectively). In order to drastically reduce the amount of fungicide applied in the orchard, two approaches were used: (1) a strategy involving spraying during the infection process, before fungal penetration and (2) a tunnel sprayer machine for treatment applications. Under field conditions highly favourable for disease, low rates of elemental sulphur (31.8 and 38.6kg ha−1 year−1 in 2005 and 2006, respectively) combined with low rates of copper (2.1kg ha−1 year−1 in both years) provided the best scab control and reduced scab severity on the fruits of cv. ‘Pinova’ by 97 and 98% compared with water control in 2005 and 2006, respectively. Lime sulphur was much more effective than wettable sulphur and appeared to be efficient at temperatures below 10°C, but its effectiveness against apple scab decreased if the treatments were applied 12–24h later than in the ‘during-infection’ spray strategy. Armicarb used alone significantly reduced apple scab severity on the leaves and fruits of the three cultivars compared with the water control. Its effectiveness was as good as wettable sulphur applied using the same timing and dosage. Silicon reduced apple scab on fruits very slightly, but not on leaves. The amounts of wettable sulphur, lime sulphur, copper, silicon and potassium bicarbonate used in this experiment to control apple scab were not phytotoxic, did not increase fruit russet, did increase the yield of each cultivar and did not affect summer density of the beneficial Typhlodromus pyri. The potential and limitations of ‘during-infection’ spraying as a protection strategy against apple scab in organic farming are discussed.

EPrint Type:Journal paper
Keywords:alternztive controle, disease management, lime sulphur, natural substances, polygenic resistance, typhlodromus pyri, ventura inequaelis
Agrovoc keywords:
Subjects: Crop husbandry
Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
Research affiliation:Belgium
Belgium > Wallonia > Centre Wallon de Recherche Agronomique (CRA-W) (Gembloux)
Deposited By: MOERMAN, Mrs Marie
ID Code:44873
Deposited On:14 Dec 2022 08:00
Last Modified:14 Dec 2022 08:00
Document Language:English
Refereed:Peer-reviewed and accepted

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