ISHS Acta Horticulturae 416: IV International Symposium on Computer Modelling in Fruit Research and Orchard Management
COUPLING A DISEASE EPIDEMIC MODEL WITH A CROP GROWTH MODEL TO SIMULATE YIELD LOSSES OF GRAPEVINE DUE TO PLASMOPARA VITICOLA |
| Authors: | Ph. Blaise, R. Dietrich, M. Jermini |
| Abstract:
Recognizing that optimization of spraying strategies is only possible if we can quantify the consequences of a crop protection decision. The problem is in the quantification of the risks of yield losses through diseases incurred at any time of the season. To address this problem for downy mildew on grapevine, we coupled a dynamic crop growth model of grapevine with a simulation model of downy mildew epidemics. The two previously developed models interact with each other. The effect of the host on the pathogen occurs through the available colonizable area, and the ontogenic resistance of the leaves. The pathogen influences the grapevine in two ways i) infection of berries leads to their destruction and reduces the sink effect exerted by the fruit mass, ii) leaf infections reduce the photosynthetically active leaf area. Simulation results using three years of historical data corresponding to different epidemic patterns are presented and discussed. | |
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