This phenomenon is purple cabbage infected with brown rot, the disease can occur throughout the reproductive period, the incidence of seedlings is widespread and serious, often causing large dead seedlings. The pathogens mainly invade the rhizomes of the plants and make the diseased areas brown. Most diseased seedlings are slightly contracted after infection, and the roots and radicles become brown and necrotic and rot along the disease. In the adult stage, many roots and roots are rotted brown. At the same time, the petioles at the base are grey-brown to purple-brown with necrosis and rot, eventually causing the plants to wilt and die. Can use 70% thiophanate-methyl wettable powder 600 times or mancozeb spray; early onset can be sprayed 47% Garnett WP, focus on the prevention and treatment of rhizomes and base petioles, spray once a week, and even spray three times.
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