Compatible interaction between the Brussels sprouts cultivar Cyrus and P. brassicae. P. brassicae infects leaves, stems and roots of Brussels sprouts cultivar Cyrus. Lesion development on the adaxial side of a leaf 4 days post inoculation (dpi) with isolate CBS686.95 (A). Stem lesions 4 dpi with, from left to right, isolates CBS686.95, HH and GFP transformant 155m (C). Root infection 4 dpi with isolate HH (E). Mycelial structures visualized by GFP fluorescence in leaf (B), stem (D) and root (F) tissue, 5 dpi with GFP transformant 155m. Hyphal protrusions are indicated by arrows. Scale bars represent 100 μm (B, D) and 10 μm (F).