What is the yellow edge of corn leaves? What causes yellowing of the leaves under corn?

The yellowing of corn leaves may be caused by lack of water or drought. As a result, the upper leaves of the young corn plant are rolled up and dark, and the leaf edges or leaf tips are yellow in severe cases, and then dry up; It may also be caused by pests and diseases, such as the mealybug insect at the seedling stage, which will be concentrated in the base, root and leaf sheath of corn seedlings near the surface, absorb the juice, and cause the corn leaf sheath to turn yellow and dry up;

It can also be caused by nitrogen deficiency, which can lead to dwarf corn plants and pale leaf color, especially at the base.

If the corn seed is not full, or the old seed is of inferior quality, the corn yellow leaf is inevitable.

Prevention method: When buying seeds, be careful, do not buy miscellaneous seeds, and choose seeds that are suitable for local cultivation. The depth of sowing is also directly related to the growth of the plant, too deep is easy to lead to weak seedlings, yellow seedlings, when the corn grows, the leaves will slowly turn yellow.

Prevention method: the sowing depth should be controlled at about 3-5cm, the lack of seedlings should be replenished in time, and the weak seedlings should be sprayed with foliar fertilizer in time to alleviate it.

There are several possibilities for yellow leaves at the seedling stage of corn, and the order of analysis according to the probability is:

1. Waterlogging. Corn seedlings are drought tolerant but not waterlogged, and excessive watering leads to poor root respiration and stunted growth, so the leaves turn yellow.

2. Corn seedling blight.

2. Potassium deficiency. Potassium deficiency in base fertilizer leads to potassium deficiency in corn. Potassium deficiency is the yellowing of the edges of corn leaves.

3. Nitrogen deficiency. Corn requires very little nitrogen fertilizer at the seedling stage, so the possibility of nitrogen deficiency is low. Unless your land hasn't been nitrogen-fertilized for years, or it's newly cleared. Nitrogen deficiency is the yellowing of the veins of corn leaves.

4. Drought. The likelihood is low, and the maize seedling stage is drought tolerant.

It should be rust leaf disease, wheat leaves are also prone to this disease, hurry up to buy medicine to spray, it will be transmitted to other healthy leaves.

For nutrient deficiency, supplement some trace elements such as nitrogen and zinc, and foliar sprays are OK.

According to the different varieties of corn, the corn leaves are about 12-18 pieces, while the ordinary medium and late maturing corn is about 16 pieces, among which the upper, middle and lower three leaves of the corn ear have the largest leaf area and the longest functional period. So, what causes the yellowing of the planted corn leaves?

1. When there is water shortage or waterlogging, the upper leaves first appear curled, and in the case of sufficient nitrogen fertilizer, they are still dwarf and weak, the leaf clusters turn yellow-green, and the leaf edges or leaf tips turn yellow when they are severe, and then the leaf tips or leaf edges of the lower leaves dry up. This is due to the obstruction of respiration and nutrient transport in the corn root system, resulting in yellowing of the leaves.

2. Potassium deficiency yellow leaves, when potassium is insufficient, the old leaves begin to lose green and necrosis, and gradually develop to the middle leaves, fading green from the tips and edges of mature leaves, first spotted, and then connected into pieces. When potassium deficiency is severe, there are necrotic spots on the leaf tip and leaf margin, and the leaf margin dries up and forms a charred shape.

3. Zinc deficiency yellow leaves, corn is a zinc-loving crop, in the 3-5 leaves of corn, the leaf veins in the middle of the new leaves lose green, easy to appear light yellow band area, after jointing the old leaves and diseased leaves in the midrib also appear yellow-white strips, or irregular yellow patches on both sides.

4. Sulfur-deficient yellow leaves, when sulfur is deficient, the new leaves first yellow, then the stems and leaves turn red, sometimes the new leaves are uniform yellow, the leaf tips and leaf bases remain light green, and the old leaves are red at the base. The symptoms of sulfur deficiency are somewhat similar to those of nitrogen deficiency, but nitrogen deficiency is the first symptom on the old leaves, while the symptoms of sulfur deficiency are the first to manifest on the young leaves, because sulfur is not easy to move in the corn body.

In addition, yellowing of corn leaves may also be caused by certain pests and diseases.

In addition to the natural aging factors, the yellowing of corn bottom leaves is also related to factors such as drought, waterlogging, soil poverty, fertilizer damage, pesticide damage, insect pest, soil deficiency, light level, dense planting, and maturity. Not only a single factor can cause the yellowing of the leaves at the bottom of the corn, but also the mixing of multiple factors can cause the yellowing of the leaves at the bottom of the corn. Therefore, the yellowing of the leaves at the bottom of corn needs to be correctly judged in time and the crux of the problem can be found out before symptomatic control measures can be taken. First, natural aging; Any plant has the function of metabolism and the introduction of the new; The bottom leaf of maize is the earliest germinating maize reproductive tissue, and it is also the earliest important reproductive tissue responsible for maize photosynthetic transformation, chlorophyll synthesis, and cyclic nutrient transmission. When the corn continues to grow, when the upper leaf plays the role of corn reproduction, the bottom leaf also completes its historical mission and gradually enters the senescence period; The specific characteristic of maize leaves in the reproductive decline period is leaf yellowing.

Questions. Thank you!

The yellowing of corn leaves may be caused by lack of water and drought, which will cause the upper leaves of the young corn plants to roll up and be dark, and in severe cases, the leaf edges or leaf tips will turn yellow and dry up; It may also be caused by pests and diseases, such as the mealybug insect at the seedling stage, which will be concentrated in the base, root and leaf sheath of corn seedlings near the surface, absorb the juice, and cause the corn leaf sheath to turn yellow and dry up; It can also be caused by nitrogen deficiency, which can lead to dwarf corn plants and pale leaf color, especially at the base.

This shows that the corn field is not very transparent, so the leaves below are not able to get enough sunlight, so this situation occurs. Part of the reason may be that the lack of water is a kind of self-protection of corn, so the leaves under it begin to turn yellow to prevent some nutrients and water from being wasted.

The first is that there are a lot of bugs in the ground that cause the leaves to turn yellow, the second is that they are lacking in fertilizer and nutrients, and the third is that you don't have enough to water them.

There are many possible reasons for yellow streaks on corn leaves, and here are some of the possible causes:1Viral Infection:

Corn is often infected with a variety of viruses, such as mosaic virus, spotted virus, etc., which can cause yellow streaks on corn leaves, and are usually accompanied by other symptoms, such as leaf deformation and curling. 2.Malnutrition:

Corn needs to absorb enough nutrients such as nitrogen, phosphorus, and potassium, and if the soil does not contain enough of these elements, or if the plant is unable to absorb these elements, it will cause yellow streaks on the leaves. 3.Pests and diseases:

Corn is attacked by pests and diseases, such as borers, aphids, etc., which can also lead to the appearance of yellow streaks. 4.Insufficient hydration:

Corn needs plenty of water to grow and develop, and if there is not enough moisture in the soil, or if the climate is dry, it can cause yellow streaks on the leaves. 5.Ambient temperature too high or too low:

The optimal temperature for corn growth is 20 -30, if the ambient temperature is too high or too low, it will affect the growth and development of corn, resulting in yellow stripes on the leaves. If your corn leaves show yellow streaks, it is recommended that you carefully observe the leaves for other symptoms, such as spots, rotting, shedding, etc., and whether there are signs of pest or germ infestation. At the same time, check the nutrient status and moisture status of the soil, as well as whether the ambient temperature is suitable.

Take appropriate measures according to the specific situation, such as fertilization, spraying, watering, etc., to help the corn return to healthy growth.

Summary. If you find yellow streaks on corn leaves, you can take the following measures:1

Timely removal of diseased leaves: Cut off infected corn leaves and clean up any remaining diseased leaves and other plant residues in a timely manner. This effectively reduces the risk of disease spreading.

2.Pay attention to watering and drainage: Corn prefers a moist environment, but excessive watering can cause the soil to lose its air permeability, which can lead to damage to the plant's root system.

Therefore, it is particularly important to water and drain water properly, and the impact of disease can be reduced by adjusting the amount of watering, strengthening ventilation, etc. 3.Fertilization:

Lack of nutrients may also cause yellow streaks on corn leaves, and proper fertilizers can be added to the soil to replace the missing nutrients such as nitrogen, phosphorus, potassium, etc. 4.Use of pesticides:

For example: mancozeb: this pesticide can effectively prevent and control a variety of plant diseases, such as powdery mildew, late blight, etc.

Dear, the yellow streaks on corn leaves may be caused by the fact that corn is resistant to powdery mildew. Corn powdery mildew is caused by a fungal infection that forms a white acre-sized powdery substance on the surface of the leaves, and can form yellow or white streaks on the leaves. In addition to powdery mildew, other disease signs and abiotic factors such as lack of nutrients can also cause similar streaks.

If you find yellow streaks on corn leaves, you can take the following measures:1Clean up the diseased leaves in time:

Cut off the infected corn leaves and clean up the remaining disease leaves and other plant residues in a timely manner. This effectively reduces the risk of the spread of the disease. 2.

Pay attention to watering and drainage: Corn prefers a moist environment, but excessive watering can cause the soil to lose its air permeability, which can lead to damage to the plant's root system. Therefore, it is particularly important to water and drain water properly, and the impact of disease can be reduced by adjusting the amount of watering, strengthening ventilation, etc.

3.Fertilization: Lack of nutrients may also cause yellow streaks on corn leaves, and appropriate fertilizers can be added to the soil to replace the missing nutrients such as nitrogen, phosphorus, potassium, etc.

4.Use of pesticides: eg:

Mancozeb: This pesticide can effectively prevent and control a variety of plant diseases, such as powdery mildew, late blight, etc.

1. Lack of moisture.

The yellow leaves of corn are most likely caused by a lack of moisture. Although corn has a certain drought tolerance, if there is no rain and no watering for a long time, the soil will be prone to drought and yellow, and the leaves will turn yellow, which will also affect the normal growth. If this situation is caused, it is recommended to irrigate as soon as possible, control the amount of water, ensure that the soil is slightly wet, and it is strictly forbidden to have water accumulation.

Second, the amount of water is too large.

Corn with yellow leaves may also be caused by too much watering or continuous rainfall, and water accumulation in the soil. Corn is afraid of waterlogging, and if there is water in the soil, it will affect growth. When watering, the amount of water should be well controlled.

In case of continuous rainfall, it is necessary to drain the stagnant water in the plot in time, and strengthen ventilation to evaporate the stagnant water as soon as possible.

3. Lack of nutrients.

The yellowing of the leaves of corn may also be caused by a lack of a certain nutrient. For example, if potassium is lacking, the old leaves at the bottom are prone to yellowing. If zinc is lacking, new leaves are prone to yellowing.

Whatever the cause, it is important to treat it as soon as possible. If potassium is lacking, plant ash can be applied appropriately or potassium dihydrogen phosphate fertilizer can be sprayed. If zinc is lacking, kilograms of zinc sulfate can be applied per acre.

4. Infection with pests and diseases.

When corn is infected with pests and diseases, the leaves will also turn yellow, and the common disease is stem base rot, and the insect pests are mostly underground pests. The plot of the disease should be sprayed with the corresponding agent for treatment. During the cultivation and management period, it is necessary to provide a suitable environment, strengthen fertilizer and water management, enhance tree strength, and improve the disease resistance and stress resistance of maize.

Yellow leaf disease, also known as banana panama disease, is caused by poisoning with toxins produced by the bacteria. Internal symptoms manifest as yellow to brown lesions of pseudostems and bulbs in vascular bundles, mottled or linear, and later run through into strips or lumps. The wooden ducts at the roots turn reddish-brown and extend into the bulb, then black-brown and withered.

The prevention and control of yellow leaf disease can be divided into agricultural control and pharmaceutical control.

Agricultural control: pay attention to drainage to prevent water and rotten roots. Fertilization should be appropriately kept away from banana heads to prevent root breakage and root injury, and reduce the chance of bacterial infection. More cassava residue, bagasse, lime, etc. were applied to improve the soil environment, making it unfavorable for the growth of Fusarium;

Pesticide control: carbendazim is very effective in preventing the disease and using it in the initial stage, and there are 3 ways to use it: wet the root zone soil with 1000ppm carbendazim; Inject 3 ml2 of carbendazim solution in bulb**; Post-species.

At 5, 7 and 9 months, carbendazim capsules (65 mg) were placed in the bulbs.

There will be many problems in the growth process of plants, leaf yellowing is one of the phenomena, the color of the leaves begins to appear when corn is planted, sometimes the color begins to fade when it grows, and gradually turns yellow, and the yellowing area is getting larger and larger, the yellowing of the leaves affects the growth and development of corn, and in serious cases, it will also affect the quality of corn, which is caused by lack of water, lack of certain nutrients or pests and diseases.

There will be many problems in the growth process of plants, yellowing of leaves is one of the phenomena, when corn is planted, the color of the leaves begins to appear green, sometimes the color begins to fade as it grows, and gradually turns yellow, and the yellowing area is also getting bigger and bigger.

The yellowing of the leaves affects the growth and development of corn, and in severe cases, it will also affect the quality of corn, which is caused by lack of water, lack of certain nutrients or pests and diseases.

1. Some corn leaves turn yellow due to lack of water or excessive water, the leaves will curl when there is lack of water or waterlogging, and the leaves will also turn yellow-green when the fertilizer is sufficient, and the leaf edges or tips will turn yellow when they are serious.

2. The yellowing of some corn leaves is caused by the lack of certain nutrients, and when potassium is insufficient, the old leaves of the friendly type begin to lose green and die, and gradually develop to the middle leaves; When sulfur is deficient, the new leaves first yellow, then the stems and leaves turn red until the whole plant turns yellow and red.

3. The yellowing of some corn leaves is caused by pests and diseases, the lower leaves of the corn plant with base rot are yellow, if the corn plant has traces of decay, the pathogen generally enters the corn stem through the wound, which will cause the leaves to turn yellow, dry and rot, and gradually spread to the leaves.

What to do with corn yellow leaves.

1. For the yellowing of corn leaves caused by lack of water or waterlogging, spray irrigation should be carried out in time during drought, but it should be noted that waterlogging should not be caused by flood irrigation, and drainage should be carried out in time.

2. In view of the lack of nutrients or the invasion of pests and diseases, you can add farmhouse potassium fertilizer or Hefeng granular zinc to the corn field, spray insecticides on the diseased plants, and pay attention to the appropriate amount when spraying insecticides.