Rainfastness of lime sulphur and other inorganic fungicides used for scab control in apple and pear production. , 23-28


  • Jamar, L. , Song, J. , Fauche, F. , Choi, J. & Lateur, M. (2018). Rainfastness of lime sulphur and other inorganic fungicides used for scab control in apple and pear production. , 23-28. IOBC-WPRS Bulletin / Bulletin OILB-SROP. Proceedings in: 11th International IOBC-WPRS Workshop on Pome Fruit Diseases, Jürmala, Latvia, 26-30 June 2017, IOBC-WPRS Bulletin / Bulletin OILB-SROP, 23-28.
Type Conference Proceedings
Year of conference 2018
Editor IOBC-WPRS Bulletin / Bulletin OILB-SROP
Conference name 11th International IOBC-WPRS Workshop on Pome Fruit Diseases
Conference location Jürmala, Latvia
Publisher IOBC-WPRS Bulletin / Bulletin OILB-SROP
Edition The IOBC-WPRS Bulletin is published by the International Organization for Biological and Integrated Control of Noxious Animals and Plants, West Palearctic Regional Section (IOBC-WPRS).
Volume 138
Pages 23-28
conference Date 26-30 June 2017
Endnote keywords apple, pear, organic, sulphur, copper, rainfastness, orchard
Endnote Keywords fungicide, lime sulphur, organic farming, pear scab, potassium bicarbonate, rainfastness
Abstract The aim of this study was to determine, under controlled and field conditions, the rainfastness of new fungicide formulations available for organic apple and pear farming. The rainfastness was assessed by both (i) analysing the content of residual chemical elements present on the leaves subjected to various amount of rain (from 0 to 30 mm) using an atomic emission spectrometer (ICP-AES) under controlled and field conditions and (ii) measuring scab control effectiveness on inoculated seedlings following various amount of artificial rain (from 0 to 30 mm) applied on the leaves under controlled environment. The field study in apple orchard shows that with protective applications of lime sulphur (2%), copper hydroxide (0.1%), wettable sulphur (1%), and potassium bicarbonate (1%) subjected to 33 mm of precipitation, leaves still contain, respectively 61, 48, 36, 43 % of elemental sulphur, copper or potassium ions applied initially. This means that among sulphur formulations, lime sulphur shows significantly higher past effect on the leaves. The greenhouse study on seedlings shows that protective applications on dry leaves of lime sulphur (2%), wettable sulphur (1%), copper hydroxide (0.1%) and potassium bicarbonate (1%) significantly reduced pear scab severity with more than 96% effectiveness, on susceptible cultivars, under high scab pressure. Lime sulphur revealed a better resistance to rain compared to wettable sulphur, copper and bicarbonate, providing scab-intensity control effectiveness of 85, 52, 28, 6% and scab-severity control effectiveness of 92, 64, 75, 27%, respectively, after an application of 30 mm of artificial rain. Others formulations such as Heliosoufre, Heliocuivre and Armicarb were also tested in this study.
Fichier 2018_iobc-wprs_bulletin_2018_138.pdf
Authors Jamar, L. , Song, J. , Fauche, F. , Choi, J. & Lateur, M.