[1] Wageningen Univ & Res, Lab Phytopathol, NL-6708 PB Wageningen, Netherlands
[2] DCM NV, NL-2153 PK Nieuw Vennep, Netherlands
[3] Scientia Terrae Res Inst VZW, B-2860 St Katelijne Waver, Belgium
[4] Katholieke Univ Leuven, Dept Microbiol Immunol & Transplantat, Lab Viral Metagen, REGA Inst, B-3000 Leuven, Belgium
[5] DCM Corp, B-2280 Grobbendonk, Belgium