Cabbage Disease Control: Recognize the Symptoms and Strengthen Management to Reduce Losses

Cabbage, also known as head cabbage, is susceptible to infection by various pathogens during its growing period. Disease control means preventing and reducing disease through integrated means such as agricultural management, biological measures and chemical agents, so as to ensure firm heads and good yield and quality. Whether control is done properly often directly affects the harvest of a whole season.

Common diseases in production include black rot, soft rot, downy mildew, sclerotinia rot and viral diseases. Black rot mostly shows V-shaped yellowish-brown lesions from the leaf margins, with the vascular bundles turning black accordingly; soft rot often strikes during the heading stage, with the head turning soft, rotten and foul-smelling; downy mildew produces a white mold layer on the underside of leaves and spreads very quickly in rainy, highly humid conditions.

The key to control lies in prevention rather than cure. Before planting, disease-resistant varieties can be selected, seed treatment carried out, and rotation with non-cruciferous crops practiced to reduce the primary sources of infection in the soil. In field management, attention should be paid to reasonable planting density, timely drainage to lower humidity; diseased plants should be pulled out as early as possible and taken out of the field, and the planting holes can be disinfected by scattering lime.

Chemical control should use the right agent for the right disease at the early stage of onset, choosing different agents for different diseases, and care should be taken to rotate them to delay resistance; biological control methods such as microbial preparations can also be combined to reduce the pressure of chemical pesticide use. When it clears up after rain and temperatures rise, diseases tend to become epidemic, so inspection should be strengthened and follow-up control applied promptly to avoid yield loss from the spread of the disease.