The pathogenic cauliflower-Rhizoctonia interaction, as observed for the first ranked isolates of AG 1-1C, AG 2-1 and AG 1-1B, closely followed by AG 4 HGII, was characterized by a high rate of directed growth, formation of infection cushions and stomatal penetration accompanied with the absence of defence responses and a strong degradation of pectin. The gene discussed is RENBP; the disease is infection.