Prediction of Sclerotinia stem rot on oilseed rape in Switzerland | Prevision du risque de sclerotiniose du colza en Suisse
2003
Gindrat, D. | Frei, P. | Vullioud, P. | Pellet, D. (Station federale de recherches en production vegetale de Changins (RAC), Nyon (Switzerland))
Surveys of sclerotia deposits and isolations from oilseed rape petals showed that apothecia of Sclerotinia sclerotiorum were formed and petals contaminated every year in various regions of Switzerland from 1991 to 2002. However, severe stem rot was observed only in years where air temperature averaged or was beyond 12 °C between early and full blooming (growth stages BBCH 61 to 65). This temperature threshold accounts for the poor relation between the contamination of petals and the severity of the disease. In the field, all oilseed rape cultivars cultivated in Switzerland were susceptible to Sclerotinia stem rot to some extent, except cv. Capitol. A relation was obtained between disease severity and yield. A simple method for predicting at growth stage 65 a risk of severe stem rot is proposed. The role of moisture (rainfall, dew) should be defined more precisely in order to refine the prediction method.
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