Can you grow leeks without pesticides? How to effectively control leek maggots?

If you plant leeks in a large area, whether it is pesticides or fertilizers, you need to use them, if you are a small area, you can plant them at home, balcony or yard, you don't need them, you want leeks to grow better, and you can use more good imported water-soluble fertilizer, which can not only provide nutrition, but also improve the disease resistance of leeks and prevent the occurrence of leek maggots.

Leek topdressing method: leek seedling stage to promote its growth, generally in the leek seedling height of about 12 15 cm combined with watering and secondary fertilizer.

The height of leek seedlings grows to 18-20 cm, which is the appropriate period for leek planting. Before planting, a large amount of well-rotted organic fertilizer should be applied in the planting ground to create a better living environment for the growth of leeks. Mu is applied to imported water-soluble fertilizer, sprinkled, ploughed into the soil, and leveled the land according to the cultivation method for furrow or planting ditch, furrow

High-quality farmhouse fertilizer is applied to the ditch, and the fertilizer can be planted after being evenly mixed with the soil.

After planting, the leeks go through the hot summer and enter the cool autumn. At this time, it is the most suitable growth stage for leeks, and it is a critical period for fertilizer and water management.

Root growth lays the material foundation. The ability of leeks to overwinter and the growth of the next year depend mainly on.

The amount of nutrients accumulated by plants before winter, and the accumulation of nutrients is determined by the growth status in autumn, so fertilizer and water management should be done well at this stage. Generally, it is necessary to chase 2 or 3 times of Ribery Yanwo water-soluble fertilizer.

I remember that there was a base that used two kinds of mixtures to be applied together.

Hello, leek maggot, also known as leek maggot, root maggot, generally refers to the leek late-eyed mushroom mosquito, sometimes including other mosquitoes and fly pests, is currently the most important in leek production, but also the most stubborn control object.

The hosts of leeks include leeks, green onions, garlic and other flowers and medicinal materials, and leeks are the most seriously affected and extensive. The hatchling larvae first feed on the upper end of the young stem at the base of the leek leaf sheath, and in spring and autumn, they mainly damage the young stem of the leek, so that the root rots, and the aboveground leaves wither yellow and die; In summer, when the temperature is high, it moves downward, borers eat into the bulbs, and in severe cases, the bulbs rot and the whole mound dies. Once the leeks are harmed by leek maggots, the leek seedlings wither and cannot germinate new sprouts, although some germinate new sprouts, but the growth is weak, and it takes 1 2 years of cultivation to return to normal growth.

Prevention and control methods. Choose resistant varieties. At present, there are no varieties that are completely immune to leek maggots, but some varieties have certain resistance to leek maggots, such as Yinchuan narrow-leaved leek, Guangzhou large-leaved leek, and Guangxi fine-leaved leek.

Generally speaking, non-dormant varieties have stronger resistance to leek maggots than dormant varieties, and varieties with strong growth strength have more obvious resistance to leek maggots.

Scientific fertilization. Apply fully decomposed organic fertilizer, and do not pour manure during the peak adult period. Fertilization should be done by ditching and deep covering soil. According to the experimental results of Shandong Agricultural University, if sheep manure is used as organic fertilizer in leek field, it has a good control effect on leek maggots.

Irrigation control. In early spring and autumn, especially when the autumn larvae occur, irrigate continuously for 3 days, once a day in the morning and once in the evening. It is advisable to flood the back of the ridge with irrigation, so that the leeks and maggots suffocate to death and reduce the damage.

Add an appropriate amount of pesticide for better results. After the leeks are harvested, stir well with 3% ammonia water, and irrigate the roots after 15 to 20 minutes, which can reduce the damage of leek maggots.

Summary. Hello, the reason for the occurrence of leek maggot is that this kind of insect likes the smell of leeks, green onions, garlic and other crops very much, and then the temperature and humidity of planting are also very like, maintenance is to eat the sprouts and young leaves of leeks, resulting in serious losses for farmers, the prevention and control methods are: farmers can apply thiamethoxam + cyantrantranidin 100-200 ml per mu with water.

Or 300 ml of 40% clothianidin, and 800 ml of 20% clothianidin. Generally, it can achieve more than 95% control effect.

What causes leek maggots? What are the hazards? How to prevent it?

Hello, I have seen your question, and I am sorting out the answer, please wait a while Hello, the reason for the occurrence of leek maggots is that this kind of insect likes the smell of leeks, green onions, garlic and other crops very much, and then the temperature and humidity of planting are also very like, and the maintenance is to eat the sprouts and young leaves of leeks, resulting in serious losses for farmers, and the prevention and control methods are: farmers can apply thiamethoxam + cyantraniliprole 100-200 ml per mu with water. Or 300 ml of 40% clothianidin, and 800 ml of 20% clothianidin.

Generally, it can achieve more than 95% control effect.

The method of using high temperature prevention and control method, plastic film covering method, and sprinkling plant ash is clear to many farmers who make leeks, and plant ash is omnipotent.

Leeks are planted in a fixed place, can grow for many years, the soil environment foundation is good, conducive to the subsequent long-term growth; Vegetables that have been planted in the previous crop are lily plants like leeks or cruciferous vegetables such as cabbage and mustard that have obvious pests such as aphids, cabbage, greenworms, etc., have a high chance of breeding diseases and pests, so it is not recommended to plant leeks in that place.

Some could be used. Use some other vegetables for control, and you can also do it through same-sex rejection**.

There are two main types of <> mole crickets: North China mole cricket and Oriental mole cricket, and the Oriental mole cricket is common and harmful. Mole crickets occur once every 1-2 years, and adults or nymphs overwinter underground, and the damage is serious in spring and autumn.

It prefers humid environment, and is more seriously affected by riverside, damp vegetable fields and loose and damp sandy loam vegetable fields. It is nocturnal and nocturnal, with a peak of active feeding from 9 p.m. to 3 a.m., often on the topsoil or the ground, and even more so after rain. It has phototaxis and moisture-loving properties, and has strong tropism to sweet substances such as fried soybean cakes, wheat bran and horse manure.

Generally, 10-20cm topsoil is most active when it is wet.

Main prevention and control methods:

Poison bait booby-trapping. Cook with wheat bran, soybean cake, cotton nut cake, rice bran 5kg until three mature and dry to semi-dry, add 48% Lesben EC or 50% phoxanthion EC 50-100ml or add 90% dichlorophos 50g, 30 times the water is mixed into a poisonous bait, each mu is used to sprinkle on the surface in the evening, or after the emergence of the poisonous bait is sprinkled in the tunnel where the mole cricket is active, which can also treat grubs, needleworms, crickets, etc. Poison bait orange shouting can also be mixed with 40% Lesben emulsifiable concentrate 500ml of water 10 times and 50kg of bait, or 4% dimere powder and bait according to 1:

5. Mix. Soil treatment. In the seedbed or vegetable field with serious damage of mole crickets, 2-3kg of 5% phosphine granules or l0% diazinong granules per mu are mixed with 15-30kg of fine soil and sprinkled on the bed soil, sowing ditch or transplanting hole, and covered with soil after sowing and vegetable seedling transplanting. The seedbed can also be irrigated with 30 times of 80% dichlorvos EC or 800-1000 times of 50% phoxanthion EC.

Light booby-trap. In the windless and sultry evenings of summer and autumn, various insect trap lamps are used to attract adult insects, combined with manual capture. In addition, nests can be artificially dug in early spring or summer to kill insects or eggs.

Why do leeks give birth to leek maggots? How can it be prevented? The adult worms of leek maggots are yellow-footed mushroom mosquitoes that tend to yellow and blue light and are sensitive to odors and sweetness.

Leeks have the physiological property of skipping roots. After the new bulb is formed, the old bulb and roots must rot and develop a smell that attracts breeding flies to lay eggs here and produce maggots. Odors from uncleaned shallots after harvest and the use of organic fertilizers that are not adequately decomposed can also attract adults to lay eggs and maggots.

Leek is a kind of vegetable that is planted all over the country, rich in nutrients, and loved by most people, but it is susceptible to various underground pests in the process of growth, among which leek maggot is the most common, the most harmful, and the most difficult to control.

Leek maggots are mainly harmful to young stems and basal bulbs and larvae of leeks. The eggs of the adult worms are concentrated under the surface or in the bulb and leaf sheath of leeks. After the eggs hatch, the larvae first injure the base of the leek leaf sheath and the upper end of the bulb.

As the larvae grow, the mature larvae begin to bite the bulb or underground stems and leaves, causing the aerial parts of the leeks to wilt and die due to lack of nutrients and water, and the larvae pupate in the bulbs or roots after aging.

Resistant varieties can be selected to protect against leek maggots. In general, non-dormant varieties are more resistant to leek maggots than dormant varieties, and vigorous varieties will also have better resistance to leek maggots. In early spring, late autumn and early winter, it should be watered once in the morning and once in the evening, and the amount of watering should be submerged on the back of the ridge for 3 days, which will suffocate the leek maggots.

What is the effect of leek maggots.

1. In Henan, Shanxi, Shaanxi, Gansu, Hebei and other places where the leek-blackhead maggot disease is not serious and the cost of medication per mu is not high, 500ml-1000ml of "vegetable Xiaobai" can be washed with water.

2. In Hebei, Shandong, Northeast and other places where the occurrence of leek blackhead maggots is serious and the cost of medication per mu is high, the dosage per mu can be increased to 1000ml-2000ml mu, and rinsed with water;

3. For dry land, sandy land and leaky land, you can first water with water, and then rinse the medicine, so that the use effect will be better.

The prevention and control of leek maggot should first implement crop rotation stubble, onions, garlic, leek vegetables are similar to the pests and diseases, easy to infect each other, so when leeks are sown or transplanted, if the previous stubble is onions, garlic vegetables, then underground pests, especially leek maggots, will also make the fungus source accumulate, aggravate the occurrence of diseases, will inevitably cause leeks to emerge low seedlings, poor growth potential.

There are 2 reasons for leeks to produce leek maggots, one is to plant leeks with loam, the other is to apply unrotted organic fertilizer, apply fully decomposed organic fertilizer, do not pour manure in the peak period of adult occurrence, fertilization must be done ditch deep application and then cover the soil, remove the roots of leeks, that is, the usual root drying soil, there are 5 6 days to dry the larvae to death.

If the leek plant deteriorates, it is easy to grow maggots, and in this case, insecticides can be used to kill insects.