Common cabbage diseases include soft rot, black spot, black shank and viral diseases. Soft rot usually occurs in the late growth stage of cabbage, usually when the cabbage is encrusted; black spot mainly damages the leaves of cabbage, causing the cabbage leaves to wither and die; black shank mainly damages the leaves and young stems of cabbage. Circular lesions will appear when the disease occurs; the virus disease occurs in the seedling stage of cabbage. When the disease occurs, chlorotic spots will appear on the cabbage leaves, which will cause the entire leaf surface to turn yellow.

1. Pictures and prevention of cabbage diseases

1. Common diseases

(1) Soft rot: This disease generally occurs in the late growth period of cabbage. Generally, the disease occurs when the cabbage heads are encrusted. The pathogen invades from the base of the stem or petiole of the cabbage. In the early stage of the disease, water-soaked lesions appear on the affected parts. As the lesions slowly expand, the entire rhizome and leaf bulbs of cabbage will become infected. The disease occurs when the environment is dry and the cabbage leaves become dry. When the environment is humid, the cabbage leaves will rot and become soft and have a sour smell.

(2) Black spot disease: This disease mainly harms the leaves of cabbage. When the disease occurs, small water-soaked spots will appear on the leaves of cabbage. As the disease progresses, the spots gradually turn into small brown spots. Round spots, with brown ring halos on the edge of the lesions; when the condition is severe, the lesions appear concentric rings, and slowly develop into sunken brown spots. When the environment is humid, the lesions will also grow brown. Mold-like matter causes cabbage leaves to wilt and die.

(3) Black shank: This disease occurs in both the seedling stage and the adult plant stage of cabbage. It mainly damages the leaves and young stems of cabbage. It is more serious in the seedling stage and will appear when the disease occurs. The lesions are round lesions that slowly change from brown to grayish white as the disease progresses, and there are small black dots on the lesions.

(4) Viral disease: This disease can harm cabbage seedlings, and it can also harm adult plants. When cabbage seedlings become ill, chlorotic spots appear on the cabbage leaves, and the leaves begin to slowly turn yellow, eventually causing the entire The leaves (except for the veins) all turn yellow; when adult cabbage plants are infected, unevenly distributed mottled spots appear on the young leaves of the cabbage, and there are dark brown necrotic spots on the backs of the old leaves, and the leaves become shriveled.

2. How to prevent and control

(1) Soft rot: Rotate crops reasonably in the field to reduce the pathogens in the soil; select seeds with strong disease resistance and treat cabbage before sowing. The seeds are treated with pesticides to disinfect the seeds; when diseased plants are found in the field, they are dealt with promptly. When the disease is serious, it can be sprayed with water and streptomycin to control it.

(2) Black spot disease: Choose seeds with strong disease resistance, and use chemical seed dressing to disinfect the seeds before planting; when cabbage is sick, it can be sprayed with chlorothalonil, benomyl and other chemicals to prevent and control it. .

(3) Black shank: Pay attention to reasonable crop rotation in the field, and disinfect the soil and seeds before planting. When cabbage is infected, thiophanate methyl and other agents can be used for prevention and control.

(4) Viral diseases: Choose seeds with strong disease resistance as planting objects, pay attention to reasonable crop rotation, remove diseased plants in time when found in the field, and then scientifically and rationally water and control temperatures; it can be used when cabbage is sick. Virus spirit, Ningnanmycin, Virus Bigram and other pharmaceuticals are used for prevention and control.

2. When is it suitable to plant cabbage, and what is the difference between it and cabbage?

Cabbage is suitable for planting in April in spring or September in autumn. There is no difference between cabbage and cabbage. They are the same vegetable, but their names vary from place to place. Cabbage generally refers to Brussels sprouts, also known as cabbage, cabbage and cabbage. The stems and leaves of cabbage are wrapped in a ball shape. The stems are relatively short and thick. The plant is unbranched and is green or gray-green in color. There are many leaves at the root. , wrap the knotted ball layer by layer.