What is the reason for soft leaf rot when corn has just emerged?

Caused by insufficient root fertility.

Maize is an annual herbaceous plant of the genus Maize in the family Poaceae. Aliases: maize, cob, baogu, baomi, baosu, jade, bud rice, pearl rice, bract, large reed millet, Northeast Liaoning dialect called pearl grains, Chaozhou dialect called barley kernel, Cantonese called corn, Hokkien called panwheat.

Corn is an annual monoecious cross-pollinating plant with tall plants and strong stems, which is an important food crop and forage crop, and is also the highest total crop in the world, second only to rice and wheat in terms of planting area and total yield. Corn has always been known as a longevity food, rich in egg white matter, fat, vitamins, trace elements, fiber, etc., and has great potential for the development of high-nutrition, high-biological functional foods. However, due to its complex heritability and abundant variations, there are shortcomings such as long cycle, excessive coefficient of variation, and affecting the growth and development of offspring in the conventional breeding process, and modern biological breeding technology not only overcomes the above shortcomings and deficiencies, but also improves the breeding speed and quality.

Root problems, lack of fertilizer, germs, etc. are all possible, and it is best to determine them. What is lacking is made up, and it is not good to have too much fat. At the seedling stage, a new high-lipid film can also be sprayed to form a layer of polymer and protect it. When watering, you can also rinse the roots at any time.

The roots have been bitten by bugs, or there is a lack of water.

Hello, the bottom leaves of corn are yellow and dry leaves, many corn farmers think that corn is lacking in nitrogen, not necessarily nitrogen deficiency, and the yellowing of corn leaves is mainly due to the following reasons:

1. Corn disease causes yellowing of corn seedlings, mainly due to bacterial wilt causing yellowing of lower leaves.

2. The lack of water in corn causes the yellowing of corn seedlings, and the drought in the later stage of corn leads to the lack of water in crops and the lack of nutrition, resulting in yellowing of the lower leaves.

3. Nitrogen deficiency in corn causes corn seedlings to turn yellow, and the lower leaves of corn turn yellow first, and gradually develop to the upper part, and the lower leaves die in severe cases. However, the yellowing of the leaves is from the tip of the leaf, showing an inverted "V" and gradually turning yellow.

4. Corn potassium deficiency causes corn seedlings to turn yellow, and the leaves start from the tip of the leaf in the process of yellowing, and then the edge of the leaf turns yellow and dry, and the whole leaf dies in severe cases.

5. Corn flooding causes corn seedlings to turn yellow, and the corn is flooded for a long time, generally more than 24 hours, and the lower leaves will die quickly.

Nitrogen fertilizer needs to be supplemented, but if there is a lack of phosphorus fertilizer, nitrogen fertilizer cannot be supplemented, so in this case, it is necessary to apply commonly used phosphate fertilizer, nitrogen fertilizer or Bika water-soluble fertilizer to corn.

The details are as follows:1When buying seeds, do not buy miscellaneous seeds, to buy seeds that are suitable for local planting, and good seeds, once planted and found that there are yellow leaves, top dressing and additional foliar fertilizer spraying in time to ensure sufficient nutrients required for corn growth.

2.The depth of sowing is best between 3-5cm, if it is found that the sowing is too deep, if the seedlings are missing, the seedlings should be replenished in time; Weak seedlings should be sprayed with foliar fertilizer to alleviate them.

3.Control the amount of seeds at the time of sowing, and then carry out the seedlings when the corn has 3-5 leaves after the seedlings emerge, pull out the crowded corn seedlings, don't be reluctant, this is good for the corn behind.

4.Corn is a nitrogen-loving crop, in the nitrogen fertilizer must be given enough, if in the sowing, nitrogen fertilizer application is too little, it is necessary to add urea in time to promote the normal growth of corn.

Yellow wilt of corn bottom leaves may be suffering from stem base rot.

Spray with 5% leaf brate + 25% Ruixin mildew powder (600 times liquid) or 58% Ruifu manganese zinc powder (600 times liquid) and other drugs in the flare stage.

What to do if the leaves at the bottom of corn are yellow and wilted? Dictum medicine ah gall pesticide. after bile pesticides. There are several pesticides that specialize in treating this. Go find one that you have locally, and it should be good to catch up when you're done.

But never buy food and wear it hundreds of times. Don't think that people will do it without you looking at it, and you can give up. You look at the things you like, and you use your own income to carry the frustration of the snails.

There are several ways for corn leaves to turn yellow and dry up:Reasonable watering: If the yellow leaves are caused by drought, they should be replenished as soon as possible and watered thoroughly. If there is water in the plot due to too much precipitation, the water should be drained as soon as possible.

Reasonable top dressing: corn lacks potassium and is easy to yellow leaves, so more plant ash or spraying potassium dihydrogen phosphate foliar fertilizer should be applied. If it is caused by zinc deficiency, kilograms of zinc sulfate can be applied per acre.

Prevention and control of pests and diseases: If it is caused by infection with pests and diseases, it should be sprayed with pesticides and management.

Caused by disease or lack of fertilizer.

1. Diseases, insects and weeds: Some diseases, insects and weeds can also cause corn leaves to turn yellow and grow weakly, such as seedling blight, cotton bollworm, needleworm, ground tiger and so on.

Control methods: For the threat of diseases, insects and weeds, appropriate pesticides can be selected according to the situation of the plot for control. Yes, in addition to diseases, insects and weeds, the excessive use of herbicides and pesticides may cause pesticide damage, and will also cause corn leaves to turn yellow and dry, so the use of drugs should be scientific and appropriate.

2. Deficiency of nutrients: When crops lack certain nutrients, there will also be yellow leaves, such as when corn is deficient in zinc, it is easy to produce albino seedlings, which is manifested as foliar yellowing.

Control method: Corn is a crop that likes zinc fertilizer, so it is easy to lack zinc at the seedling stage, so you can choose soil chef multi-chelated zinc fertilizer in the later stage of timely topdressing.

Disease, waterlogging, and fertilizer damage will lead to corn seedling leaf rot, corn seedling leaf rot is a lot, and the seedling generally has no lesions, but the seedling leaves are easy to rot. The field management of seedlings is very important, and the corn seedlings are not even, and we have a lot of corn seedlings here that are not good, and the lack of seedlings is serious. Corn leaves rot seedlings are easy to be eaten by insects, and sometimes seedlings emerge.

The insect eats the leaves.

How to manage corn seedlings?

How to do a good job in field management during the period from corn emergence to jointing, that is, corn seedling stage? The aboveground part of the corn seedling stage grows slowly, the root system grows rapidly, and the field management focuses on promoting the growth of the root system and cultivating strong seedlings. The specific management technical points are as follows:

1. After the emergence of seedlings, it is timely to manually assist in releasing seedlings, checking seedlings and replenishing seedlings.

After the corn is sown, it should be manually assisted in the seedling, and the plots with more seedlings should be replanted in time, and the replanting requires soaking and germination to promote its early emergence.

2. Appropriate time seedlings and fixed seedlings.

Seedlings are thinned and fixed at the 3-4 leaf stage, and they are carried out on sunny days. First, because corn is in the "weaning period" before and after the 3-leaf stage, if the seedlings are too late, the root system between the plants will be staggered, which will lead to excessive pressure of water and fertilizer competition and affect the later growth and development. Second, diseased seedlings, insect bite seedlings and stunted seedlings are more likely to wilt in the afternoon, which is easy to identify and eliminate.

When setting seedlings, it is required to completely remove the silk smut soaked seedlings with short leaves, dense leaves, thick at the bottom and thin at the top, curved, and black and green leaf color.

3. Timely cultivation and weeding.

Cultivating is conducive to loosening the soil, facilitating the development of the root system, the seedling stage of our state is generally carried out 1-2 times, the cultivation should strictly avoid pressing the seedlings, although some fine roots will be cut off during the period, but can promote new roots, control the growth of the aboveground part of the corn plant.

4. Squatting seedlings and strong seedlings.

Squatting seedlings should start from the seedling stage to the end before jointing, and squatting seedlings should be more soil moisture as appropriate, with the principle of "squatting black not squatting yellow, squatting fat not squatting thin, squatting dry and not squatting wet", it is recommended to keep the upper soil loose and dry at the seedling stage.

5. Scientific pest control.

The main underground pests in the corn seedling stage are yellow tigers, needleworms, grubs, mole crickets, etc., and the green control methods advocated are: first, set up a frequency vibration insecticidal lamp around the corn field for booby-trapping; The second is to trap and kill with syrup around the corn field, brown sugar, wine, vinegar, and water according to 1:2:

The ratio of 3:9 is configured, 3 5 per mu, and at the same time, it is necessary to do a good job in monitoring the insect situation in a timely manner, and carry out pesticide prevention and control as appropriate.

6. Top dressing seedling fertilizer.

The seedling stage refers to the stage after transplanting until the cob grows. The main purpose of seedling fertilizer is to make corn seedlings grow better, and seedling fertilizer will be divided into seedling fertilizer and seedling fertilizer. Generally, the seedling fertilizer is generally carried out 11 days after the corn is planted, and the seedling fertilizer should be used together with the cultivator when the corn seedlings grow to 41 cm to 51 cm each time the fertilizer is applied.

Seedling fertilizer generally has compound fertilizer, phosphate fertilizer, potassium fertilizer, urea, etc., (such as Trim granule compound fertilizer) as long as it is a hole application method, so that corn seedlings can absorb more nutrients and grow better.

After the corn emerges, the corn cob curls leaves, twists, and then slowly rots, what is going on?

Pro, Fusarium top rot. From the seedling stage to the adult plant stage, the heart leaves rotted and dried up from the base of the leaves, tightly wrapping the inner heart leaves, making them unable to twist in a whip-like shape. or longitudinal cracking at the base of the heart lobe, and the leaves are deformed, shrunken or twisted. The plants are often dwarfed, and longitudinal cracks can be seen at the base of the stem, with brown lesions; Most of the seriously diseased plants do not bear fruit or the female ears are thin and small, and even wilt and die.

Pathogens generally invade from wounds or young tissues such as stem nodes and heart leaves, and insect pests, especially thrips and aphids, will aggravate the occurrence of diseases. Mainly because of pests and diseases, which cause rot.

Leaf wilting and rotting during earing of corn can be caused by a variety of diseases. Here are the possible causes and workarounds:

Corn leaf spot: This is a disease caused by a fungus that usually occurs in a humid environment. Yellow or brown spots appear on diseased leaves, and as the disease worsens, the leaves wilt and rot.

Prevention methods include using healthy seeds, avoiding overwatering, maintaining distance between plants to promote air circulation, removing diseased leaves in a timely manner, and using fungicides.

Corn rust: This is a disease caused by a fungus that usually occurs in humid and warm environments. Orange or red spots appear on diseased leaves, and as the disease worsens, the leaves wilt and rot.

Prevention methods include using healthy seeds, avoiding overwatering, keeping plants at a distance to promote air circulation, removing diseased leaves in a timely manner, and bringing fungicides with the belts.

Corn leaf blight: This is a disease caused by bacteria that usually occurs in humid and warm environments. Yellow or brown spots appear on diseased leaves, and as the disease worsens, the leaves wilt and rot.

Prevention methods include using healthy seeds, avoiding overwatering, maintaining distance between plants to promote air circulation, removing diseased leaves in a timely manner, and using fungicides.

Corn mosaic virus: This is a disease caused by a virus, usually transmitted by aphids. Yellow or white spots appear on diseased leaves, and as the disease worsens, the leaves wilt and rot.

Prevention methods include using healthy seeds, regularly inspecting and removing infected plants, and using pesticides to control aphids.

In conclusion, the best way to prevent corn leaf wilting and rotting is to use healthy seeds, keep the plants healthy, avoid overwatering, keep the plants at a distance to promote air circulation, remove diseased leaves in a timely manner, and use fungicides or insecticides to control the disease.

Causes of corn leaf dieback.

1. Corn planting is low, poor drainage, too large planting density, poor ventilation, and too much nitrogen fertilizer.

2. There are differences in the disease resistance of different corn varieties, and corn varieties with low disease resistance are prone to corn leaf death.

3. Climatic factors, high temperature and rainy climate are easy to produce bacterial diseases, especially rainfall after high temperature, resulting in increased humidity in the field, rapid development and reproduction of disease sources, infecting corn plants, and causing corn leaves to die.

The main reason is that Keshi rock can not be what you said, there is no **, you can only judge and speculate.

The reason you say may be due to the excavation, but it is not necessarily the main cause.