The heart of corn is oxtail shaped. What is the disease

1. There are two main reasons why corn hearts are oxtail-shaped.

1.Thrips and Swedish flies are infested. Peeling off the outer lobe reveals that the base of the heart lobe has shrunk and has a hole.

The main manifestations are the twisting of the heart leaves of corn, the broken and shrunken leaves, and the appearance of holes on the leaves. There is a transparent film-like substance on the front of the leaves, some heart leaves have mucus in them, and some heart leaves have been broken. The main reason for this is that summer maize is infested by thrips or Swedish flies at the leaf stage of 5 and 6.

In some fields, the leaves of summer maize have silvery-white spots, or the leaves are deformed, cracked, and cannot be twisted into a "cow's tail" shape, and the tillers are clustered to form multi-headed plants. The occurrence of coated corn seeds or mixed fields is light, and the insecticides added to the fertilizer are also light, and the occurrence of iron stubble sowing is serious. Among them, thrips and Swedish flies damage the heart lobes, producing mucus, causing the heart lobes to be abnormal and twisted into a "bull's tail" shape.

2.Post-emergence herbicide damage. Thrips and Swedish flies infested leaves are more or less damaged, such as twisted leaves are not broken due to the use of post-emergence herbicides containing nicosulfuron-methyl.

It is characterized by severe dwarfing, distortion of the heart lobes, inability, and branching. Some are corn heart leaves twisted, rotten heart, yellowing leaves, weak growth, corn plant height is shorter than that of undamaged pesticides, and the leaf curling plant rate is 10%. The first reason is that the purity of domestic nicosulfuron is not enough, which causes drug damage.

Some are because spraying at high temperatures, or repeated spraying can also cause pesticide damage. There is also the age of corn more than 5 leaves, the liquid medicine can not be sprayed into the heart, such as the heart leaf accumulation of liquid medicine, can cause distortion, leaf whitening or rotten heart, the plant will also be dwarfed. Then because the herbicide is applied too late, the corn will produce the pesticide damage of onion tubular leaves, mainly because some hybrid varieties are sensitive to pesticides, resulting in the normal extraction of the spike.

Second, prevention and control methods.

1.Immediately cut off the upper 1 4 leaves with scissors, or manually break the twist, and fertilize and water, foliar spray "gibberellin" (920), the application amount is 1 gram plus 15 30 kg of water, or spray 1000 times the plant growth regulator "Tianfengsu" (brassinolide), or high-efficiency foliar fertilizer "double effect king", 1 bag of 40 ml of water 30 45 kg, or 6000 times love more + potassium dihydrogen phosphate + 1% urea solution + zinc, boron-containing micro-fertilizer, 5 7 days 1 time, spray 2 times.

2.If it is caused by insect pests, thrips and Swedish flies should be controlled in time when summer corn has 5 or 6 leaves, and spraying should be sprayed to prevent and control the disease during the corn trumpet period. The recipe is:

10% imidacloprid 1000 times or 5% acetamiprid 1500 times plus 500 800 times of agricultural streptomycin, plus some gibberellin or high-efficiency foliar fertilizer, spray again every 5 7 days, and spray 2 times in a row.

3.If the heart leaf is deformed and distorted due to herbicide damage, attention should be paid to the selection of high-quality corn post-emergence herbicides, and attention should be paid to avoiding the use of drugs at high temperatures, and the appropriate time should be used to prevent drug damage caused by too late medication time.

You're saying that there are some of the reasons for the distortion of the corn cob, which is due to the hot and dry weather this year, the continuous warming and the drought, which will cause the corn cob to be distorted, and we must get rid of it in time, otherwise it will affect the pollination and affect the yield.

<>1. Pesticide damage: Nicosulfuron with insufficient purity, or medication in high temperature periods, or respraying drugs, or using herbicides too late, can be properly watered for such situations, and fast-acting nitrogen fertilizer can be applied. 2. Insect infestation:

Corn at the 5-6 leaf stage is harmed by pests such as thrips and Swedish flies, resulting in distortion of the heart leaves. 3. Physiological diseases: excessive application of nitrogen fertilizer leads to vigorous plant growth.

1. Causes of corn oxtail disease

1. Damaged by drugs.

1) Specific reasons.

The purity of some nicosulfurons is not enough, and it will cause drug damage after use.

Spraying or respraying during high temperatures can also cause pesticide damage.

If herbicides are used too late, corn is prone to allium tubular leaves.

2) Prevention and control methods.

If the degree of heart-leaf distortion is not serious and does not affect heading, fast-acting nitrogen fertilizer and watering can be appropriately applied.

If the distortion of the heart leaf is serious, the twisted leaf can be manually peeled off, and then appropriate fertilization (zinc fertilizer and boron fertilizer are added to the foliar fertilizer) and watering.

2. Insect infestation:

1) Specific reasons.

After the corn enters the 5-6 leaf stage, if it is harmed by pests such as thrips and Swedish flies, it will cause the heart leaves to be distorted.

2) Prevention and control methods.

At the seedling stage, 20 grams of 10% imidacloprid wettable powder mixed with 30 kg of water were sprayed per mu, and the focus was on the heart leaves of the plant.

In the later stage of plant growth, peel off the damaged heart leaves, especially the twisted parts, and then spray the drug, if some foliar fertilizer is added appropriately.

3. Physiological diseases.

Excessive application of nitrogen fertilizer leads to vegetative growth of plants.

2. Symptoms of corn oxtail disease

1. Damaged by drugs.

If a corn post-emergence herbicide containing nicosulfuron is used, the plant will show severe dwarfing, twisted heart leaves (unable to do so), and bifurcation, and the twisted leaves will generally not break.

2. Insect infestation:

The heart leaves are twisted, the leaves are broken and shrunken, the leaves are perforated, and the front of the leaves also appears as transparent film-like objects, and some of the heart leaves have mucus, causing the heart leaves to be unable to function properly, and then twisted into a canned ox's tail.

3. Physiological diseases.

It has a certain relationship with the characteristics of corn varieties, and in view of this situation, the leaves of twisted cherry blossom curved can be manually peeled off to assist the plant to extract the tasseling.

<> corn seedling curl is a kind of corn leaf curling phenomenon, which is usually caused by drought and water shortage or improper use of pesticides, and may also be harmed by thrips and Swedish flies; armyworm, cotton bollworm, green worm, top rot damage; or post-emergence herbicide damage. Prevention and control methods: adjust the sowing date, timely pull out the plants with curly cores during the seedling setting, cut off the part with curly cores after the seedlings, and use pesticides to prevent and control them in time.

1. What is the disease of corn seedling curl

Corn seedling curl is a kind of corn leaf curling phenomenon, called curl heart disease, corn seedling curl is usually caused by drought and lack of water or improper use of pesticides. There may also be thrips and Swedish flies; Armyworm, cotton bollworm, green worm, top rot damage. or pesticide damage caused by post-emergence herbicides.

Second, how to prevent and control corn seedlings curly

2. Strengthen field management: timely in the seedling, during which the plants found to have a curly core are immediately pulled out, and if the part with a curly core is found after the seedling, it is immediately cut off.

3. Timely prevention and control with pesticides: spray heart leaves and leaf dorses with avermectin, 5% imidacloprid 2000 times, or acetamacone and pyrethroid low-toxicity insecticides.

3. What is the cause of corn seedling curling?

1. It is usually caused by these four aspects: high temperature and drought, pesticide damage, insect pest, Swedish straw fly, and top rot. It is not excluded that it may be due to the typical symptoms of calcium deficiency in corn, which is manifested in white markings on the leaf margins and jagged irregular transverse cracking, the parietal leaf roll is "bowed", and the leaves are adhered and cannot be stretched normally.

2. It should be found and solved in time to ensure the good growth environment of corn seedlings.

<> corn leaf curl is mainly caused by drought and lack of water or improper spraying of pesticides, and may also be caused by rice leaf roller, thrips or Swedish straw fly. It is recommended to strengthen field management to ensure that maize can obtain sufficient nutrients and grow vigorously during the growth period.

1. What is the cause of the appearance of curly celery in corn?

1. Caused by drought and lack of water or improper spraying of pesticides: the herbicide spraying time is not good, when the corn is more than 5 leaves old, it is easy to get disease, which is manifested as distortion, white or rotten leaves, and dwarfing of the plant.

2. Caused by pests:

1) Three types of pests: rice leaf roller, thrips or Swedish straw fly: the performance is to peel off the outer leaf and find that the base of the heart leaf has shrunk, there are holes, there is a transparent film on the front of the leaf, and some heart leaves have mucus in the heart leaf to cause the heart leaf to be abnormal, twisted into a "bull's tail" shape, and individual heart leaves have been broken.

2) Armyworm, cotton bollworm and green worm damage: armyworm and green worm damage corn heart leaves, which are manifested as pests and insect feces in the heart leaves, and cotton bollworms damage the leaves with uneven edges.

3. Hazards of top rot: caused by Fusarium or a variety of bacteria, manifested as a whip-like heart leaf, the outer layer of the heart leaf tightly wraps the inner heart leaf, so that it can not be whip-shaped, the leaf is deformed, shrunken or twisted, and rot, dry rot or wet rot can often be seen at the base of the heart leaf, with or without odor. 、

Second, what are the prevention and control methods?

The main thing is to strengthen the field management of corn fields:

1. Adjust the sowing date: according to the local climate, advance the sowing date of summer maize and avoid sowing in high temperature and humidity weather.

2. Combined with the seedlings, it is found that the jade closed rice seedlings have the center of the plant, and all the plants should be pulled out in time. At the same time, fungicides, foliar fertilizers and plant growth regulators such as fungicides, brassin, and Tianbao were applied to promote the recovery of corn growth.

4. Pesticide control: generally use avermectin, 5% imidacloprid 2000 times solution, can also use acetamethromide, pyrethroid low-toxicity insecticides, spray heart leaves and leaf back, the control effect is obvious.