Control methods of common diseases and insect pests of scallions

Welsh onion is widely planted in China and is one of the common crops, but when planting, there are often diseases and insect pests that harm its yield and quality, bringing serious economic losses to growers. So what are the common diseases and insect pests of green onions? How to prevent and cure it? Let's take a look at the detailed introduction.

1. Soft rot

Soft rot is a bacterial disease, which is easy to occur in the environment of high temperature and humidity. when the plant has mechanical wound or worm-eaten wound, the pathogen invades and causes the plant to infect the disease. When the disease occurs, the stems and leaves on the ground lodge, the base of the stem is rotten, there is a stench, it is very easy to pull out, and the plant is easy to die in the later stage of the disease.

Prevention and control methods: pay attention to the humidity in the field, so as not to accumulate too much water in the rotten roots, be careful when cultivating the soil, so as not to cause damage to the plant, strengthen the pest control measures, and do not encounter the prevention and control of agricultural streptomycin sulfate when the disease occurs.

2. Purple spot

Purple spot mainly harms leaves and pedicels, when the disease appears water-stained white spots, and then gradually become light brown round or spindle-shaped slightly sunken spots, will continue to expand, the disease spots become brown or dark purple. The disease is more serious in the warm and hot summer, and the disease is serious in the old temple and the fields with insufficient fertility.

Control methods: reasonable rotation, increase the application of organic fertilizer and phosphorus and potassium fertilizer, improve plant disease resistance, in the initial stage of the disease can be sprayed with chlorothalonil, disinfectant alum and hydantoin control.

3. Onion rust

Onion rust mainly harms the stems, leaves and pedicels of Welsh onions. Orange-yellow or dark-brown sore spots appear at the disease site, and rust-colored powder will be emitted at the disease spot in the later stage, which is the origin of its name.

Prevention and control methods: do a good job in fertilizer and water management

To increase phosphorus and potassium fertilizer, mancozeb and chlorothalonil can be sprayed at the initial stage of the disease, once every 10 days, 2-3 times continuously, and the effect is better.

4. Liriomyza sinensis

Liriomyza sinensis is mainly harmful to larvae, its larvae will eat in the leaves, continue to eat mesophyll tissue, resulting in a decline in yield and quality, but also spread a variety of diseases, the main attack time is from May to October.

Prevention and control methods: clear the garden comprehensively after harvest, take the diseased and residual plants out of the field, dig deep into the soil, eliminate the overwintering eggs under the ground, and can also make poisonous soil to kill. In the outbreak period, avermectin can be sprayed with better results.

The above is an introduction to the prevention and control of common diseases and insect pests of scallions. I hope I can help you. If you want to know more about it, please follow us.