Green onions are common crops and are grown in many places in China. For growers, the most troublesome thing is the harm of pests and diseases. They have a great impact on the variety and yield of green onions, causing great losses to growers. So how to effectively prevent and control? The following describes the prevention and control measures of four common pests and diseases.
Prevention and treatment methods of four common diseases and insect pests
First, soft rot
Soft rot is a bacterial disease, which is easy to develop in a high temperature and high humidity environment. When a plant has a mechanical wound or a worm wound, the pathogen is infested and the plant is infected.
symptom:
When the disease occurs, the stems and leaves on the ground are lodging, the base of the stem is rotten, and there is a foul smell. It is easy to pull out, and the plants are easy to die in the late stage of the disease.
Control method:
1. Strengthen management, deep sorghum, cultivate strong seedlings, transplant at the right time, apply enough base fertilizer, and timely control underground pests.
2, the implementation of rotation: and onions, cabbage, cabbage, celery, carrots, potatoes, garlic and other crop rotation.
3, pay attention to the field humidity, so as not to accumulate too much water to rotten roots, be careful when cultivating the soil, so as not to cause damage to the plant, in the onset of the disease can be sprayed with 2% spring seromycin.
Second, purple spot disease
The disease is more serious in the summer of warm and high temperature, and the field with insufficient fertility is seriously ill.
symptom:
At the time of onset, water-stained white spots appear on the lesion, and then gradually turn into a light brown round or a spindle-shaped slightly depressed spot, which will continue to expand, and the lesion becomes brown or dark purple.
Control method:
Rational rotation, increase of organic fertilizer and phosphorus and potassium fertilizer, improve plant disease resistance, spray 50% procymidone WP 1500 times solution, or 50% iprodione WP 1000 times solution, or 75% at the beginning of the disease Chlorothalonil WP 500 times solution and so on.
Third, onion rust
symptom:
This pest mainly causes damage to the stems, leaves and pedicels of the green onions. At the beginning of the disease, the lesions turn from orange-yellow to dark brown sores, and rust-colored powders will be emitted from the lesions.
Control method:
Pre-prevention can do a good job in fertilizer and water management and increase phosphorus and potassium fertilizer. In the early stage of the disease, it can be sprayed with mancozeb and chlorothalonil once every 10 days for 2-3 times, and the effect is better.
Four, the fly
Mainly in the larvae, it harms the green onions. The larvae of the larvae will feed on the leaves. The nutrients obtained by feeding the mesophyll tissue will often cause the yield and quality of the green onions to decrease, and will also spread various diseases. The main attack time is 5-10. month.
Control method:
After the harvest of the green onion, the clearing garden treatment will be carried out, the sick plants will be removed, and the soil will be turned over, and the eggs that are hidden under the soil for wintering will be completely eliminated, or the poisonous soil will be poisoned. If a large-scale outbreak occurs, it can be sprayed. Vermicillin, 31% Avi, fly.
The above is the introduction of the symptoms and prevention of four common pests and diseases in the cultivation of green onions. No matter what crops are planted, pests and diseases are indispensable. What growers can do is to do pre-prevention and post-production prevention. I hope that the contents of Xiaobian can help everyone!
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