1. Symptoms

The disease mainly damages carrot fleshy roots. After the plant is injured, the stems and leaves turn yellow and wilt, the roots show symptoms of wet rot, the fleshy tissue is softened, gray-brown, and the diseased part has juice overflowing and has a foul smell.

2. The route of transmission and the law of disease

This disease is caused by the carrot soft rot disease Erwinia spp. Carrot soft rot pathogenic bacteria. Field hosts exist in Guangxi vegetable areas all year round, and pathogenic bacteria can spread and spread without obvious overwintering. Pathogenic bacteria are spread by irrigation water, rain splashes, small insects and underground pests. Pathogenic bacteria invade from plant wounds and stomata and water holes of leaves. Generally in rainy years or hot and sultry weather, it is easy to induce disease, and this disease also occurs in vegetable fields where underground pests occur seriously.

3. Control methods

(1) In severely ill areas, we should carry out paddy and dry crop rotation or crop rotation with onion and garlic vegetables.

(2) Deeply plow the soil or irrigate the field, then dry and prepare the ground, and use high-border planting.

(3) Prevent and control underground pests to avoid damage to roots.

(4) Check the field frequently, and drain the stains in time after rain. If diseased plants are found, they should be dug up immediately, destroyed in a centralized manner, and the diseased caves should be disinfected with lime.

(5) At the early stage of the disease, spray with a solution of 14% copper complex ammonia solution 300 times.

(6) Dig gently when harvesting to minimize wounds. (Reproduced from Hong Kong company registration)