It is a pest of "Brassica oleracea", "Brassica rapa" and "Brassica napus". The larvae feed on "Brassica oleracea" and "Brassica napus". The fungus is an important pathogen of "Brassica napus" (canola) crops. The species "Brassica napus" belongs to the flowering plant family Brassicaceae. Mendel (Brassica napus L.), as a clubroot-resistant crop. The closely related "Brassica napus" (Rapeseed) is considered a better oilseed crop in comparison.