What are the symptoms of soft rot of cabbage? How to treat it?

Cabbage soft rot, also known as rot, rotten pimple, rotten gourd, rotten gourd head disease, water rot disease, off the son, is the main disease of cabbage production, mainly damage leaves, tender succulent tissue and stem or root. The initial performance was completely different from that in the later stage. The disease not only caused harm in the late growth stage of Chinese cabbage, but also continued to expand the damage during storage, resulting in rotten cellar. What are the symptoms of cabbage soft rot? How to treat it?

What are the symptoms of soft rot of cabbage?

1. Basal rot type: the base of the plant is rotten, the outer leaves droop and stick to the ground, the ball is exposed, and the whole plant falls to the ground at the slightest touch, which is commonly called "hanging off" by vegetable farmers in the north.

2. Heart rot type: the plant decays from the top down or from the base up, which is commonly called "rotten pimple" or "rotten gourd" by vegetable farmers in the north.

3. Leaf coke type: the leaf edge of the outer leaf of the plant is scorched, and the diseased leaf loses water quickly and dries up in the shape of tissue paper, which is commonly called "burning edge" by vegetable farmers in the north.

Under the above three kinds of symptoms under dry conditions, the rotten diseased leaves gradually lose water and become dry by the sun, showing a thin paper shape, close to the leaf ball. The malodorous smell of hydrogen sulfide is produced in all the rotten parts of the disease, which becomes an important feature of the disease and is different from black rot. The seed-bearing strains of Chinese cabbage stored in the cellar also fell ill after planting, causing the seed-collecting plants to die ahead of time.

Second, how to treat the soft rot of cabbage?

1. Select disease-resistant varieties

Generally speaking, the disease of Qingbang is slighter than that of Bai, and the disease resistance of late-maturing species is stronger than that of precocious ones. The careless straight Chinese cabbage is upright in the outer leaves of the field, well ventilated, and the disease is lighter than that of the spherical type, but on the contrary, when the spherical varieties are stacked during the storage period, there are gaps between each other, which is beneficial to ventilation, and the disease is lighter than that of the straight type. Qinggang disease-resistant varieties are Liaobai 21, Beijing Xin 3, Jingqiu 80, Jinqiu 1, Longbai 6 and so on.

2. Pay attention to the cultivation conditions

In principle, continuous cropping or adjacent cropping with cabbage, tomato, potato and other crops is not carried out to reduce the incidence of diseases.

After harvest, the former crop should turn over the soil and sun up the field as soon as possible to promote the decay and decomposition of the disease and residue; ridging cultivation of Chinese cabbage was selected, and the disease of high border cultivation was lighter than that of flat border.

Base fertilizer should be properly applied to mature farm manure and phosphorus and potassium fertilizer to promote the vigorous growth of Chinese cabbage and improve its ability to resist pathogen infection. Late sowing should make cabbage avoid the high temperature and rainy season and reduce the disease.

Reasonable close planting, and time seedlings to determine seedlings, remove old leaves, yellow leaves, diseased leaves, increase field permeability; timely extraction, deep burial of diseased plants, diseased soil digging and exposure to reduce the source of the disease.

3. Timely control of insect pests and control of disease spread

Attention should be paid to the control of underground pests in the early stage, and insects should be checked frequently from the larval stage. When pests such as yellow striped beetle, aphid, cabbage worm and diamondback moth are found, spray control should be done immediately.

4. Chemical control

It is found that the diseased plants should be removed immediately, and the diseased plants and their surrounding healthy plants should be irrigated with medicine solution to prevent the spread of the disease. During the initial stage of the disease, the drugs were sprayed every 7-lO day, alternately, and sprayed for 2-3 times according to the condition.

Optional agents are copper hydroxide, cuprous oxide, thiobacillus copper, copper ammonia complex, copper oleic acid, zinc Dysen, neo-phytomycin, Jia Ruinong and so on.