How to control carrot black rot

Carrots are rich in vitamins and have a very good effect on the human body. Black rot is the most common disease of carrots, which will directly affect the quality and yield of carrots and endanger the interests of planting friends. So how do we control carrot black rot? Next, I would like to introduce to you the black rot and its control measures.

1. The affected area

Carrot black rot is a fungal disease caused by some fungi, and it is also the most common disease in carrot diseases. It occurs in carrot-growing areas all over the world. In China, the disease is more serious in Anhui, Fujian and other eastern areas, and the harm is becoming more and more serious in recent years. Carrots can get sick at all stages of growth.

2. The cause of disease

First of all, it may be due to seed reasons, the seeds themselves carry fungal viruses, which begin to occur after emergence, resulting in the occurrence of fungal viruses. Infection during seedling emergence can lead to the collapse of seedlings that have not yet been unearthed. Mature old leaves are also more prone to disease, forming small black spots on the petiole, and then spreading to the whole leaf, causing all the leaves to die. In severe cases, it will develop all the way to the head of the carrot and rot into black. Too humid storage environment can also cause.

3. Time of onset

The disease is mainly due to the bacteria on the diseased seeds and remnants as the source of invasion, which can survive for more than 5 years in the diseased seeds and soil. It can be transmitted by soil, wind and other substances, and it is easy to catch the disease when the temperature and humidity is too high. In North China, the disease usually occurs from July to September, with the highest incidence in August. Around June 2012, a large area of precipitation across the country led to the early onset of carrots in some areas, and none of the serious areas were spared.

4. Reasons for prevention and control

When selecting seeds, disease-resistant seeds should be selected, and continuous cropping is not recommended. Coating seeds, cleaning up diseased bodies and disinfecting fields are the most effective ways to prevent black rot. Before harvest and storage, the affected diseases should be cleaned, the black rot parts should be removed, and the temperature and humidity of the storeroom should not be too high. Some time before the onset of the disease, chlorothalonil suspension was sprayed for prevention, once a week for about a month. If a disease occurs, it should be removed immediately, pastoral disinfection, spraying tebuconazole suspension and other agents, once a week for a month.

Black rot is a thorny disease in carrots. Once the disease is difficult to control, prepare for prevention before sowing and during the disease period. Before storage, the storeroom should be disinfected to control the environment of the storeroom, which can also greatly reduce the incidence of the disease. All right, the above is a brief introduction to black rot. If you want to know about other diseases of carrots, please continue to follow the pro-farm network!