1. Department of Entomology and Plant Pathology North Carolina State University Raleigh North Carolina USA
2. US Department of Agriculture‐Agricultural Research Service, Forage Seed and Cereal Research Unit, and Department of Botany and Plant Pathology Oregon State University Corvallis Oregon USA
3. Department of Plant, Soil and Microbial Sciences Michigan State University East Lansing Michigan USA
4. Plant Protection Department Diagnostics Laboratory Slovenian Institute for Hop Research and Brewing Žalec Slovenia