Which of the following crop families are primarily affected by clubroot disease?

Clubroot disease primarily affects plants in the Brassicaceae family, which includes crops such as cabbage, broccoli, cauliflower, and other cruciferous vegetables. The disease is caused by the soil-borne pathogen Plasmodiophora brassicae, which infects the roots of these plants, leading to the formation of galls or "club-like" swelling that inhibits nutrient and water uptake. This ultimately results in stunted growth, wilting, and reduced yield.

The significance of identifying Brassicaceae as the correct answer lies in understanding crop management and disease prevention strategies. Knowing that clubroot targets this specific family helps in implementing crop rotation, resistant varieties, and soil management practices to mitigate the impact of the disease on these economically important crops. Understanding the specific host range of Plasmodiophora brassicae enables farmers and advisers to devise effective agricultural practices to manage and control the spread of clubroot disease.