The causes and control methods of the latest onion head rot

Onion, also known as onion, originated only in West Asia, but now it is cultivated in all regions of our country, the market demand is also huge, and the economic benefit is remarkable. Now it absorbs a lot of farmers to plant. However, there are many problems in planting that affect the yield and commerciality, and onion head rot is one of them. The following pro-agricultural network brings the causes and prevention methods of onion head rot. Let's learn about it.

1. Rot caused by disease

Onion planting will be affected by a variety of diseases, which endanger the normal growth and development of onion, and seriously cause a large number of plant death. There are many diseases that cause onion head rot, such as onion dry rot, onion dry rot, onion corm rot, onion Aspergillus Niger, onion aspergillosis, these diseases have different characteristics, but they all rot onion head in the later stage of the disease.

Prevention and control methods: we must pay attention to the prevention and control of diseases, disinfect the soil and seeds before planting, eliminate the bacteria carried in the soil and seeds, strengthen fertilizer and water management, increase the application of phosphorus and potassium fertilizer, and improve disease resistance. It was found that some of the diseased plants were removed and taken out of the field, disinfected the disease points, and sprayed the corresponding chemical control.

2. Decay caused by physiological diseases

The so-called physiological diseases refer to some diseases caused by improper management of onions during planting, such as the lack of calcium in onions will cause onion head rot, germination occurs during onion storage, resulting in large consumption of nutrients, causing bulbs to become soft and hollow, causing rot In the later stage of onion bulb growth, the leaves and leaf tips turn yellow, resulting in hollow leaves without new leaves to replenish the leaf sheath, which leads to leaf sheath loosening. When watering or raining, water flows into the bulb, causing bacterial infection and rot; in addition, mechanical damage is caused for some reason during planting, harvesting and storage, which can also lead to bacterial infection and rot. There are also uncomfortable storage environment, high temperature and humidity, so that onions sprout, root, resulting in rot.

Prevention and control methods: according to various causes of decay, prevention and control should be carried out, such as calcium deficiency should be supplemented in time, organic fertilizer should be properly applied during fertilization to ensure the supply of trace elements, and it is best to plant, harvest and storage management. avoid decay due to the above reasons.

3. Rot caused by insect pests

The main causes of onion head rot caused by pests are onion maggots or root maggots, which are common pests when onions are planted, mainly when the larvae are in low harm, gnawing on the bulbs, resulting in the onion can not grow normally, and in serious cases, the leaves wither and turn yellow and rot.

Prevention and control methods: the pest adopts the method of combining agricultural control with drug control, eliminating all weeds and residues in the field before overwintering, preventing adult spawning, or preparing trapping agents and inducing spawning, and natural enemies can also be used for prevention and control. Drugs can be used to control insect pests during the outbreak period, but we should pay attention to the concentration and dose of the drugs, so as to avoid drug damage to onions.

The above are the causes and control methods of onion head rot brought by pro-agricultural network. I hope it can help you. If you want to know more about onion planting, please pay attention to pro-agricultural network.