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Predicting the spore infection depending on climate to model the Heterobasidion annosum dynamics in even-aged Pinus pinaster stands: results from FORRISK project
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Edité par CCSD -
International audience. Over the past 30 years, in the Landes de Gascogne forest (maritime pine; one million hectares), Heterobasidion root disease has increased its distribution. A previous study showed that it occurs more frequently in well-drained sites than in humid and dry, sandy soils. Understanding how the forecast increase in warm dry summers and wet winters along the Atlantic coast of France will change the incidence of the pathogen is crucial for integrating the losses and managements costs against this disease. In order to investigate the intra-annual climate variability, a three-year experiment was carried out on air-borne infection. H. annosum spore deposition was monitored on freshly cut wood discs exposed during 24h. Another key point concerns growth losses in trees depending on annual and individual growth rate. Diameter growth loss was investigated by analyzing annual growth increment of pairs of healthy trees vs. infected trees during few years. After implementation of these results into a model, simulations were carried out with different levels of infected stumps. The model provides a means of incorporating the impact of root disease into the future forest planning.
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