Plasmodiophora brassicae is a soil-borne pathogen that causes clubroot disease in brassica crops such as cabbage, cauliflower, and broccoli. The disease causes swollen, deformed roots that can lead to stunted growth and lower yields. There are several synonyms for this pathogen, including Plasmodiophora campestris, Plasmodiophora wasabiae, and Plasmodiophora brassicae Woronin. Regardless of the name used, it is important for growers to be aware of the presence of this pathogen and take measures to prevent its spread. Crop rotation, improving soil drainage, and planting resistant varieties are all effective methods for controlling clubroot in brassica crops.