Symptoms of Chinese cabbage rot:
Wilting disease The onset period of wilting disease starts from the 6-7 leaf stage, and the symptoms are that the leaves fade, dull and dehydrated from bottom to top, and then the whole plant wilts quickly until it dies. The roots of diseased plants are short and few, and they are waterlogged and rotten. It is easy to pull up when the condition is serious, and the cross section is short and shortened. The section is light brown, rotten, and has no fishy smell. This symptom is different from soft rot.
In the early stage of soft rot, the outer leaves wilted and returned to normal in the morning and evening and rainy days. With the aggravation of the disease, the outer leaves collapse, leaving the leaves bare and then turning into brown sticky soft rot. Dipping develops from the base of leaves to the shortening of stems, which makes the root pulp rot and overflows gray-yellow sticky substances until the whole plant rots.
Control methods of Chinese cabbage rot;
The first agricultural measure is crop rotation to avoid continuous cropping. The second is high-edge cultivation. In addition to drought and water shortage and saline-alkali land, high border cultivation should be adopted, and the border height should be 5- 10 cm. Third, light irrigation with small water to avoid flooding and timely drainage after rain. Fourth, increase the application of phosphorus and potassium fertilizers, implement formula fertilization, and enhance disease resistance. Fifth, live broadcast is adopted to avoid infection of wound germs caused by transplantation. The sixth is to pull out the diseased plants, remove the diseased bodies, take them out of the field and bury them deeply.
Chemical control 1 Fusarium wilt: at the initial stage of the disease, spray 75% chlorothalonil wettable powder 600 times, 60% antiviral alum wettable powder 500 times, or 72.2% acaricide 600-800 times, and spray 1 time every 7- 10 days for 2-3 times. 2。 Soft rot: First, timely control aphids, Pieris rapae, Plutella xylostella and underground pests. The second is to spray 3000-4000 times of 72% agricultural streptomycin on leaves at the beginning of the disease, focusing on diseased plants and surrounding plants, paying attention to spraying petioles and stem bases near the ground. When the condition is serious, 700 times Dixon solution can be used to irrigate the roots.
The above is about how to solve the problem of Chinese cabbage rot. I hope the above can help you.