Green prevention and treatment of leek maggots without a trace
Leek maggots are the most common, most severely harmful and difficult to control underground pests on leeks. In the past, in order to effectively control the harm of Leek maggots, a large number of highly toxic and highly toxic pesticides were used, which often caused pesticide residues. Here are some green prevention and control methods. The leek maggots can be killed without pesticides for your reference. 1. Harmful characteristics of leek maggots Leek maggots are the larvae of the mosquito mosquitoes. They are the most important underground pests on leeks, green onions, garlic and other vegetables. The larvae mainly damage the young stems and bulbs of the leek base. Adults lay their eggs under the surface soil or in the bulbs and sheaths of leek. After the eggs hatch, the young larvae first damage the base of the sheath and the upper end of the bulbs. As the larvae grow larger, the mature larvae begin to bite the bulbs or underground stems and leaves, causing the aboveground part of the leek to wither and die due to the inability to obtain sufficient nutrients and water. The larvae pupate on the bulbs or roots after they mature. Leek maggots are not tolerant to high temperatures. When the temperature is high in summer and autumn, the larvae move downwards and penetrate into the leek bulbs, causing a large amount of rot in the bulbs, leading to the death of the whole leek. In severe cases, large areas of field may die. 2. The law of occurrence of leek maggots Leek maggots occur in all parts of the north and south of our country. Generally, they occur in 4 generations per year in the northern region. The larvae live on the stem base and bulb plate of the leek. In March of the following year, when the temperature is suitable, the larvae begin to move again. In early April, the larvae enter Mature larvae enter the peak period of damage. From July to August, due to the aging of leek plants, high temperature, heavy rainfall and frequent rainfall, the larvae move downward and the damage is reduced. In late September, as the temperature decreases, the larvae rise again. Mobile, in early and mid-October, entered the second peak of harm. In November, as the temperature gradually decreased, the larvae entered a state of overwintering, and the damage gradually reduced. 3. Green control methods (1) Control time: Generally in summer and autumn seasons with high temperatures, choose continuous sunny weather to quickly increase the temperature and achieve the purpose of killing pests. (2) Cut the leeks: In order not to shade the leaves of the leeks and affect the temperature of the soil irradiated by the sun, the leeks that have grown tall can be cut along the surface before covering, and try to be as flat as the ground. (3) Covered shed film: Cover the border surface where the leeks are cut with a light blue non-drip film with a thickness of 0.1～0.12mm, and press tightly around it to prevent the heat from escaping. (4) Uncover the film and let the air blow: the temperature of the ground within 5 cm of the border rises to above 40°C for 3 hours, and basically all the leek maggots in the ground can be killed. At this time, the plastic film is opened for ventilation. (5) Watering to promote seedlings: After removing the film, water in time to promote the sprouting and growth of leeks. Generally, about 20 days, the full recovery of leeks will be exactly the same as other leeks, and all the maggots will be basically killed. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone
Color waxy corn is generally white, yellow, red, purple and black, white, yellow and purple corn is the basic color. The purple gene in a purple/white hybrid will naturally become purple if it "beats" the white gene, and vice versa, if it's a tie, what we see is a white/purple corn. Purple can turn into red corn and black corn, which is often called "red is purple, black is purple."
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