1. Department of Microbial Ecology; Netherlands Institute of Ecology (NIOO-KNAW); Wageningen The Netherlands
2. BioDetection Systems b.v.; Amsterdam The Netherlands
3. Laboratory of Organic Chemistry; Wageningen University; Wageningen The Netherlands
4. Laboratory of Phytopathology; Wageningen University; Wageningen The Netherlands
5. Institute of Biology; Leiden University; Leiden The Netherlands
6. Department of Plant Pathology; University of California; Davis CA USA