How to solve the phenomenon of white spots and dry tips on green onion leaves?

Green onions have white spots and dry tips on their leaves. When white spots appear in the form of dots, and then more and more, in severe cases, the white spots can be connected into one piece, the chlorophyll is damaged, and the nutrients of the leaves** are blocked, resulting in dry peaks. If not prevented in time, the drying phenomenon of green onion leaves will gradually expand, which will not only affect the normal growth of green onions, but also seriously affect the quality of green onions, bringing unnecessary losses to growers.

Resistance produces stinging insecticides, whether imidacloprid, acetamiprid, thiamethoxam or imidacloprid, acetamiprid, fluoroacetamide, etcThe green onion leaves are conical and cylindrical in shape and have a waxy layer on the surface. When onion farmers spray thrips control agents, it is difficult for the liquid to adhere to the leaves, which increases the difficulty of thrips control.

The germ reproduction trip of green onion has a strong reproductive capacity and can produce 8-10 generations per year. From egg to adult, each generation lasts only 14 days. They are good at hiding and hiding.

From nymphs to adults, they all deal damage. This pest, which reproduces extremely quickly and breaks badly, is really painful for growers.

When planting green onions, growers can use the method of digging. 6000 grams of 1% benzidine granules or 3000-4000 grams of 2% perchlorothiamide can be used per mu. This method can not only control underground pests such as soil maggots, but also greatly reduce the harm of thrips during the growth period of green onions.

Even if a trip occurs, the damage is easier than in a field where pesticides are not applied, and it promotes pesticide use and control.

The leaves of green onions have a layer of wax on them. When using, growers should add leaf binders such as vegetable oil to make the liquid adsorbed on the leaves of the drug, and then dilute it by suctioning, killing contact, and eliminating stomach toxins. In addition to adding additives, the method of application is also very important.

The results showed that the traditional top-down spraying method should not be used for the application of green onions, but should be sprayed horizontally or bottom-up, and the adhesion of the liquid could be greatly improved.

1) The soil moisture is high, if the humidity in the shed will cause the root system to suffocate and die, and the leaves will turn yellow in the aboveground. (2) The air humidity is high, and the air humidity in the process of green onion planting will also have an impact on the growth of green onions, resulting in the inability to absorb various nutrients normally and lead to dry tips. （3）.

The disease is serious, due to many years of continuous cropping, the soil-borne disease is serious, resulting in a large number of soft rot, blight, root rot and downy mildew. In addition, excessive soil moisture exacerbates the damage of diseases, which can cause dry and yellow leaves. (4) Nutrient insufficiency, green onion in the middle and late growth of the key to top dressing, green onion to trace amounts such as calcium, magnesium, sulfur, demand is also more, this can be carried out in the later stage of foliar fertilizer spraying.

Foliar fertilizer for vegetables can be sprayed. Rapid prevention and control of green onions, whether it is greenhouse planting green onions or open-air planting should pay attention not to irrigate the soil with too much water, generally half a month to meet the requirements of green onions for moisture, especially in spring and summer rainy weather, at this time can not be watered, but also to do a good job of waterlogging.

If such a situation occurs, then you can sprinkle some pesticides on the soil, you can also remove the green onions that are not in good condition in time, and you can also sprinkle some quicklime into the soil to remove the pests and diseases inside, which can play a good role.

You should water more, but also do a good job of insect repellent, it may be that there are some small insects in the roots of the green onions, so there will be some white spots and dry tips, to buy some pesticides to spray on the leaves of the green onions can play a role in prevention and control.

Fertilization can be done regularly, the causes of this disease should also be addressed, and care should be taken to ensure the nutrients of the soil.

Thrips harm, thrips are small, generally not easy to see, file and suck mouthparts, like a file to file the leaves to suck the juice, so the formation of this kind of lesions, now, the control effect is relatively good agents have ethyl spinosasad or spirometrian ethyl bifenthrin or halodimidoxamide or halodimidoxamide or pyroxanliprole, these agents are more expensive, good time to use, conventional agents have imidacloprid, or acetamiprid or dimethoxamine or pymetrozine, it is best to add pyrethroids, pay attention to rotation of drugs, In case of resistance, finally, thrips must pay attention to the following points, first, use the medicine in the morning or evening, second, add silicone additives or vegetable oil additives, third, spray the ground and weeds (because thrips are easy to put you inside), fourth, it is best to control and rule, otherwise you will fight in your own field, others will not fight, and the thrips in other people's fields will also run to your field! Pay attention to the usual medication time, some drugs have a long duration of effect, and pay attention to the agents with higher local effects, because thrips have different resistance to different agents in different places.

There are two possibilities for small white spots on green onions, one is thrips harm, and the other is spotted submarine fly harm, but there are certain differences between the two insect hazards: when thrips are harmed, its adults and nymphs suck the tender tips and heart leaf juice of green onions with stinging and suction mouthparts, and the damaged green onion leaves form many fine and elongated gray-white spots, the leaf tips are yellow, and the leaves are twisted and withered when they are serious. When the spotted submarine fly is harmed, its larvae zigzag through the green onion leaves all their lives, feeding on the mesophyll, and the white insect passage like a snake appears on the leaves, and the mesophyll eats on the back, leaving only two layers of white transparent epidermis, which directly affects the yield and commodity quality in serious cases.

Control methods: 50% acetamiprid 4000 times + 2% avermectin 1500 times or 10% imidacloprid 750 times + 30% myxamine 1000 times, sprayed once every 5 7 days, and in severe cases, sprayed once every 3 5 days, which can effectively prevent the occurrence of occurrence.

Due to the recent continuous cloudy rain, high temperature and high humidity will appear gray mold, green onion gray mold is the most common white spot hazard, try to prevent and control at the same time, can be used 10% imidacloprid 750 times liquid + 2% avermectin 1500 times liquid + 50% Pythium 800 times solution, 5 7 days spraying once.

On the one hand, because green onions are not only a vegetable, but also a vital seasoning, not only widely cultivated in the north and south of the country, but also have a long history of cultivation. The well-known Shandong Zhangqiu green onion has at least 3,000 years of planting history, and the introduction of the first green onion cultivation category in China can be traced back to the ancient Spring and Autumn Period and the Warring States Period. At the same time, in the operation process of green onion cultivation, if the control is slightly lax, the situation of white spots and dry tips on green onion leaves is common in the north and south, and it is widely prone to occur in the east and west.

In the process of planting green onions, if the control is not good, it is very likely to be infected by downy mildew of green onions, and yellow-white spots will be produced on the green onion leaves, but with the production of downy mildew, white mildew will definitely be produced on the lesions of green onion leaves, which is also easy to distinguish. In addition, during the growth period of green onions, it is also very likely to suffer from the infection of stoop mold, and Luo suffers from white spot leaf blight, but with the production of such pests and diseases, small black spots will be produced on the lesions of green onion leaves, which is also very easy to distinguish.

Under normal circumstances, regardless of the north and south or the east and the west, when green onion farmers plant large vertical disturbance type green onions, the most common and critical factor for the white spots and dry tips on the leaves of green onions should not be pests and diseases, but insect pests. In the final analysis, the green onions in the field have suffered damage from the green thrips, and the white spots and dry tips are also extremely common diseases presented by the green onions after the green thrips damage the green onions.

In terms of modern agricultural measures, it is possible to avoid the stubble of vegetables such as liliaceae, legumes, cucurbitaceae, and solanaceae when selecting the soil layer for green onion cultivation. Before planting green onions, plough the soil layer first, eliminate the weeds around the green onion field or the dry branches and leaves of the previous vegetables as soon as possible, kill and reduce the relative density of insect population. When thrips damage is found to be serious after planting, irrigation can be carried out on the onion field to kill thrips nymphs that are damaged in the soil layer after the second instar.

In terms of physical countermeasures, the taxiokines of allium thrips can be used to suspend blue or yellow sticky insect boards in the green onion field during the peak period with a relative density of 20-30 square meters. The size of the sticky insect board should be 25 cm to 40 cm. When suspension, the bottom end of the sticky insect plate is level with the tip of the green onion leaf, and the suspension height is adjusted with the growth and development of the green onion.

At this time, pesticides should be sprayed in time, and we must do a good job in soil drainage, and the infiltration bureau should be fertilized in time, watered in time, and must be loosened in time, and weeds must be removed and insecticidal in time.

You can sprinkle some pesticides around the green onions, or treat the green onions with insect pests, so that this problem can be solved.

This kind of manuscript spike situation may be diseased, imitation town may also be insect pest, so it is necessary to observe specifically, treat it differently, and then spray it with appropriate pesticides or manual key treatment.

Green onions are a spicy-smelling and stress-resistant vegetable. The main reason for the appearance of white spots and dry shoots on leaves is basically related to pests and diseases. Specific precautions and measures should be determined based on the patient's symptoms and general condition, and the right medication is key.

Green onions are an important food condiment with a strong spicy smell. Many people are not used to eating it, but in the vast northern regions, they have the habit of eating green onions raw. There are certain differences in the food culture of each place.

In fact, the main value of green onions is also in the white part of the green onions. The leaves of green onions are usually not eaten. The root system and foliage of green onion are important ways and means for plants to obtain nutrients.

Poor leaf surface development will directly lead to a decrease in photosynthetic efficiency or plant wilting.

Downy mildew mainly occurs near the tips and tops of green onions. The first symptoms are irregular white spots. The effect on green onions is not obvious in the early stage of the disease, but it is reflected in the flower stems and leaves, which slowly wilt.

The most effective method for this disease is to spray the drug promptly. Medications are not recommended to boost chlorophyll. You can spray 600% methyl frost manganese-zinc wettable powder with about 58 times more liquid.

When the weather is nice, it can be sprayed in the morning and evening. If the condition is severe, it can also be sprayed multiple times.

Green onions have white spots and dry tips on their leaves. If the white spots appear in a punctate shape, and then more and more, in severe cases, the white spots can be connected together, the chlorophyll is damaged, and the nutrients of the leaves are blocked, resulting in dry leaf tips. And the normal growth of onions will also be unnecessarily, if during the drying time, the leaves of the onion will gradually turn green, which will also seriously affect the quality of the onion.

The leaves of green onions have a layer of wax on them. When applying pesticides, growers should add leaf adhesives such as vegetable oil to the medicine, so that the liquid medicine is adsorbed on the leaves, and then eliminate thrips through internal absorption, killing contacts and stomach toxins. The method of application is also very important.

Practice has proved that the traditional top-down spraying method should not be used when using medicine on green onions, but should be sprayed horizontally or bottom-up, which can greatly improve the adhesion of the liquid medicine.

The first reason is likely to be the phenomenon of drought, which should be taken seriously, and the second point may be that there is some kind of toxin, so there will be white spots on it, and some pesticides should be sprayed.

Mainly due to the harm of pests, this pest will cause the green onion leaves to appear white spots dry tips, and then lead to the destruction of the chlorophyll of the green onion, the leaf nutrition is not on the first, if it can not be prevented in time, the green onion is drying up more and more serious.

In this case, it may be due to drought, or dryness due to the composition of leaf nutrients**, as well as the moisture of the soil and the humidity of the air.

Use disease-free seeds or sterilize them. It is more than 2 years of crop rotation and stubble with non-lily vegetables. Choose plots with high terrain and good drainage, use high furrow or semi-high furrow cultivation, and plant reasonably densely:

Choose a sunny day to water in the morning, drain water in time after rain, and protect the green onions by drip irrigation or plastic film under the dark water dry straw in the ditch to moisturize and cool down. During the growth period from August to October, the special compound fertilizer for green onions was applied 50 kg per mu at a time, and urea was applied twice at a time of 20 kg per mu. Spray twice before planting onions, once in seven to ten days, spray three times after planting naphthalene acetate solution, and add 20 kg of water to one piece.

There are yellow-green mottled or yellow stripes of different lengths on the leaves, the leaves are twisted and thinned, the leaf tips gradually yellow, and when the disease is severe, the growth of green onions slows down or stops and finally the whole plant dies. In the early stage of the onion of green onions, 1000 times of phytolingling emulsion was used to liquid 20% morpholinoguanidine hydrochloride. After harvesting, the diseased residues should be removed in time and taken to the field for deep burial or burning, so as to reduce the source of disease in the field.

Deep ploughing of the soil accelerates the decay and decomposition of diseased remains.

High furrow deep furrow cultivation, ditch drainage, timely ditch drainage and moisture reduction after rain, formula fertilization, timely spraying of foliar nutrients, so that the plant is strong but not too vigorous, which helps to enhance disease resistance and reduce harm. It's as if there's a layer of frost on the surface; In humid weather, if you look closely, you can see gray-white velvet mold on the surface of the diseased plants! Under normal circumstances, downy mildew and gray mold are mixed, and the biggest feature of gray mold is the appearance of white spots on the green onion leaves, which are gradually connected into pieces in the later stage!

The larvae drill the rhizomes of green onions in the ground, causing the underground part to rot and mold, the aboveground part to wilt, the leaf tip to wither or the whole plant leaf to turn yellow, and in severe cases, the green onion stops growing and even dies. 75% Fly Amine WP 3000 times liquid, 40% phosphine EC 3000 times liquid in the wintering seedlings are a little too large, with a relatively strong drought resistance, but will sprout too early, and the sprouting rate will be too high If the sowing is too late, the seedlings are too small during the wintering, the cold resistance will be weak, and the seedlings are more likely to be damaged by frost and die.