There are many pests and insects in summer, what are the management methods of summer leeks?

What are the management methods for summer leeks?

1. Don't harvest.

Due to the low nutrient and large consumption of temperature regulation in summer, the growth of plants is affected, and the leaf tissue fibers increase, the texture is rough, and the growth is weakened and the phenomenon of dormancy. At this time, the harvest is generally no longer harvested. Otherwise, it will affect the growth and yield in autumn, and will also affect the life of leeks.

Plant cultivation should be strengthened, roots should be raised, and the foundation should be laid for autumn production.

2. Fertilizer and water management.

In summer, leek fertilizer and water management must be divided into varieties, such as "stupid" leeks, because green leeks are not easy to sell, generally sell leeks, watering and fertilizing should be early, to sufficient, to provide good conditions for sprouts. Hanzhong, snow leeks and other varieties are late, generally low, can be properly controlled water, so that neither waste fertilizer and water, but also do not affect the accumulation of nutrients, and lay a good foundation for selling green leeks in winter. In order to prevent uneven fertilizer flushing with water, water-soluble fertilizer of Trim granules can be sprinkled.

But be sure to apply it when there is no dew, you can use a broom to sweep it a few times so that the fertilizer on the leaves falls to the ground, and then water.

3. Weeding management.

High temperature and rain in summer, which is conducive to the breeding of weeds and affects the growth of leeks, after each harvest and land preparation, weeds are eliminated in time, and then sprayed with 25% herbicidal ether on the ground between rows. Flower picking: Due to the flowering and setting of leeks, a large amount of nutrients are consumed, which affects plant growth, tillering and nutrient accumulation, thus affecting the yield of the next year.

Therefore, in addition to harvesting and planting, the flower sprouts should be removed in time when they are young and tender, so as to facilitate plant cultivation. Strengthen fertilizer and water management: according to seedling conditions, moisture conditions and weather conditions, water once every 7 10 days, and apply human manure and urea fertilizer 3 4 times with water.

4. Anti-lodging.

In summer, the weather is hot and rainy, and the leeks that are more than two years old are not cut in summer, and the tall leaves are easy to lodging, which seriously affects the ventilation and light transmission, and is prone to disease. In order to prevent the lodging of leeks and reduce diseases, a frame should be set up for leeks, that is, a wooden pole with a height of 30 cm is fixed along the ridge at both ends of the leek, and then a bamboo pole with a length of 2 meters is tied to the wooden basket, three thin steel wires are arranged on both sides and in the middle of the furrow in the east-west direction, and then nylon ropes are set up in the middle of the wire according to the spacing of 25-33 cm, which plays a fixed role. Then, between each ridge of leeks, the thin bamboo poles are set up on nylon ropes in the north-south direction, and the leaves can grow on the bamboo poles without lodging.

5. Leeks are harvested in a timely manner.

After the leeks are extracted, in addition to leaving the field for planting, they should be harvested in time to reduce the consumption of nutrients, which is conducive to fattening the rhizomes and increasing the winter yield of leeks.

6. Timely prevention and control of pests and diseases.

In the case of high temperature in summer, leeks are prone to wilt disease, especially when exposed to the scorching sun after heavy rain, the disease is serious. Therefore, in summer, it is necessary to pay attention to the removal of old and yellow leaves, and on the premise of maintaining good ventilation between the rows, 50% carbendazim 500 times and other agents can be sprayed every 10-15 days to reduce the occurrence of diseases. In addition, it is necessary to prevent and control leeks and maggots in a timely manner, which can be controlled by using 48% maggot and 48% Lesben emulsifiable concentrate.

At the end of summer, spray the foliage, dung heap, thatched pit, and ground with 3,000 times the liquid of pyrethroid to eliminate pests.

First of all, when planting, we must choose the soil is more fertile and wide land, and use farmhouse fertilizer, do not use fertilizer bought outside, water the plants more, but also to prevent the occurrence of pests and diseases, if there is a situation of small insects, then we must spray insecticides in time. And the temperature should also be properly regulated. If the leeks are ripe, be sure to pull them out immediately.

The most effective way is to spray pesticides that can prevent pests and diseases, and then water and fertilize more to supplement the nutrients needed by leeks. It is also necessary to clean up some dead branches and leaves, and do a good job of drainage.

Water and fertilization should be done in a timely manner, and water and fertilizer management should be strengthened, and pesticides should be sprayed regularly, and soil loosening should also be done, and sufficient light and suitable environment should be ensured, and soil permeability should also be ensured.

In the summer, the leeks should be watered every day, and pesticides should also be sprayed on the roots of the leeks, so that the leeks will grow well and the yield will be high.

Autumn is the peak season for leeks to grow, what pests do leeks love to breed? How can it be prevented?

Leek maggots Anyone who grows leeks should not be unfamiliar with leek maggots as they are the main pest that harms leeks. The newly hatched larvae first damage the leaf base of the leek and the upper end of the leek bulb. In spring and autumn, they mainly damage young stems, causing rot and causing leeks to wilt and die.

Leek maggots overwinter mainly in the soil of leek bulbs and rhizosphere 3-4 cm. From late March to mid-May, it pupates in the surface layer, lays eggs from April to May, hatches larvae from April to June, and enters the peak period of damage, the damage is milder from July to September, and the damage is aggravated again from late September to mid-October.

Then sprinkle some plant ash to kill the leek maggots. Ammonium bicarbonate also has a certain repellent effect on leek maggots. Drug control is dominated by root irrigation and spray methods such as avermectin, chlorpheniramine or a combination of both.

The best times for prevention and control are early May, mid-July and late October.

The allium scale moth is a very small insect that eats the stems and leaves of leeks, shallots, onions, etc., and the damaged leaves wilt, reducing yield and quality. Allium moths mainly lay eggs on leek leaves. After hatching, it moves to the base of the leaves, bites the leaves into some ditches, leaving only the epidermis and secretes green feces, which are easy to spot.

Mature larvae form cocoons and pupate in the middle of the leaves. When the temperature is suitable in spring and autumn, the eggs of the onium scale moth hatch in about 5-7 days and are harmed again. The control of green onion scale insect can be controlled by pyrethroid pesticide spray, which is generally used 2-3 times.

Preventive methods] Crop rotation and crop rotation, careful land preparation, seedling raising and planting should choose high dry land with deep and fertile soil, irrigated and drainable. All host plants should be other host plants that have not been planted with allium vegetables and Phytophthora tobacco within 3 years. Seedbeds should be planted in winter and fertilized for leisure.

Plough deep and fertilize rotting farmhouse manure. There is a lot of rain in the south, so high ditches should be built around the ditch to avoid water accumulation after heavy rain.

Reduce site humidity. Leeks cultivated in the open field should be protected from flooding and stagnant water in the field, and drainage should be done well in the rainy season. Watering of affected fields should be controlled or stopped.

For fields with high planting density and dark fields, "leaf sealing" measures can also be taken, that is, before entering the rainy season, the yellow leaves under the plants are removed, the green leaves are collected, and they are loosely bundled to prevent the leaves from touching the ground and promote ventilation and water loss between plants.

Allium moths, leaf miners, thrips, these are relatively common, be sure to pay attention to the use of pesticides.

Leek blight, leek gray mold , which is relatively common, must pay attention to the use of pesticides, must pay attention to the density of planting.

If farmers grow leeks, they must pay attention to proper field management in summer to ensure adequate fertilizer. Chicken manure or sheep manure can be used as the main fertilizer for the land.

The high temperature and rainy temperature in summer lead to less nutrient accumulation and high consumption of leeks, and the increase of leaf tissue fibers. At this time, it is generally no longer harvested, and plant cultivation should be strengthened to lay a good foundation for a bumper yield of leeks in autumn.

You can sprinkle some plant ash in the summer, and you can also disinfect and sterilize the soil, so that it can be better managed. to be able to make leeks grow better.

Maggots. Maggots are one of the most common insect pests during the growth of leeks, and they are also the most threatening insect pests to the growth of leeks. Maggots are the larvae of the late-eyed mosquito, these larvae mostly gather in the ground, and live on the root system of the leek, and the leeks harmed by the larvae of the late-eyed mosquito will cause the root system of the leek to rot, affect the root system of the leek to absorb nutrients and water in the soil, cause the leaves of the leek to wither yellow, and the heavy one will cause the whole leek to die.

Leek diseases and insect pests mainly include leek maggots, gray mold, blight and so on. For leek maggots, 500 ml of 2% methylavermectin EC can be diluted into 1000 times per mu for root irrigation; For gray mold, organic fertilizer can be increased, proper harvesting, timely drainage after rain, reduce field humidity, and 78% Kebo 600 times liquid can be used for pesticides; For epidemic diseases, 50% gray nucleus carb 1000 times solution or 40% sclerotinia net 2000 times solution can be sprayed for control.

Crop pests and diseases are a common problem in agricultural production, and if they are not controlled in time, they will have a great impact on the growth and yield of crops. Here are some common pests and diseases and how to control them:

Gray spot disease: It is a common disease of soybeans, wheat and other crops, resulting in round or oval light brown spots on the leaves. Prevention and control measures include removing sick and disabled bodies, strengthening ventilation, and improving nutrients**.

Leaf curling moth: It is one of the important pests of corn, cotton and other crops, and the damage mainly lies in the mechanical damage caused by the larvae burrowing into the corn core. Control measures include regular inspections, yellow plate trapping, spraying low-toxicity, environmentally friendly pesticides, etc.

Powdery mildew: It is a common disease of strawberries, tomatoes and other crops, appearing as white or off-white mycelial substances covering the leaf surface. Prevention and control measures include regular cleaning of diseased remains, increased sunlight exposure, spraying effective fungicides, etc.

Cotton bollworm: It is one of the main pests of cotton, beans and other crops, causing serious mechanical damage to crops. Control measures include regular inspections, removal of host plants, spraying of pesticides, etc.

It should be noted that in the process of control, scientific pest control techniques should be followed, pesticides should be used rationally, and attention should be paid to safe operation and environmental protection. At the same time, it is recommended to adopt integrated control strategies, such as a combination of biological control and physical control, to reduce the use of pesticides and agriculture.