ISHS Acta Horticulturae 422: International Conference on Integrated Fruit Production
REDUCED SPRAY PROGRAM FOR THE CONTROL OF APPLE SCAB, WITH THE INTEGRATION OF FUNGICIDAL PROPERTIES, CLIMATOLOGICAL AND BIOLOGICAL CONDITIONS |
| Authors: | P. Creemers, A. Vanmechelen, A. Herbots |
| Abstract:
In the past scab control was mainly based on a calendar spray scheme using more or less fixed spraying intervals. With the introduction of the curative DMI fungicides in the beginning of the eighties, it was possible to apply the scab treatments according to the scab warning devices. The last years these warning systems became more and more electronic which facilitated the transfer of the meteorological data to a central point for the calculation of the scab risk in different regions. The evaluation of the scab risk is based on the Table of Mills or a modified version, but includes only climatological conditions. With this system, 8 to 10 warnings were given per season. The excess in use of DMI's has led to a shift in sensitivity of the scab fungus for this fungicide family. Scab control was in some cases not sufficient. The consequence was that fruitgrowers feared for this evolution and returned to the old system of preventive scab control. With a better estimation of the scab risk by including also biological factors and the availability of new curative fungicide families, the curative scab control with a limited number of treatments per season will present new possibilities. | |
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