1. Dept of Ecology, Environment and Plant Sciences, Stockholm Univ. Stockholm Sweden
2. BIOGECO, INRA, Univ. Bordeaux Cestas France
3. Inst. for Life Sciences and the Environment, Centre for Crop Health, Univ. of Southern Queensland Toowoomba Queensland Australia
4. Dept of Biological Science, Florida State Univ. Tallahassee FL USA
5. Plant Protection Inst., Centre for Agricultural Research Budapest Hungary
6. Dept of Ecology, Swedish Univ. of Agricultural Sciences Uppsala Sweden