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Predicting the potential geographical distribution of parasitic weeds, a contribution to risk management: case study of Orobanche crenata

Summary
The complete article is written in German
The potential distribution of the parasitic weed Orobanche crenata was studied in a combined literature, laboratory and simulation study. Populations of the root parasite only exist in regions with mediterranean climate, although individuals are able to reach maturity under conditions of temperate climate, too, and although O. crenata seeds can survive temperatures of -20 °C. The dormancy behaviour of its seeds is likely to impede the northward spread of this species, since in a continuously moist environment, hardly any dormancy release takes place. Results of sensitivity analyses using simulation models suggest that a change to warmer and/or drier climate would substantially increase the risk of O. crenata establishment at higher latitudes. The collected information can, particularly when combined with data on host crop production, contribute to parasitic weed risk management.

german version

Keywords/Stichworte:Parasitic weeds; Orobanche crenata ; geographical distribution; global warming; dormancy

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Autor:J.H. GRENZ, J. SAUERBORN, Institut für Pflanzenproduktion und Agrarökologie in den Tropen und Subtropen, Universität Hohenheim, Garbenstraße 13, D-70599 Stuttgart, E-Mail: jangrenz@uni-hohenheim.de, sauerbn@uni-hohenheim.de

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