What causes corn leaves to be twisted together? How to prevent it?

What causes corn leaves to be twisted together? How to prevent it? Thrips are one of the most common causes of core twisting of corn at the seedling stage. When combining seedlings in the field and seedlings, the insect seedlings should be pulled out and taken out of the field for destruction, which can reduce the spread of thrips.

Symptoms are usually caused by calcium deficiency; You can eat some compound fertilizer in time to ensure that the corn can get sufficient nutrients**.

1.Damage caused by thrips. 2. Diseases caused by not adapting to a certain period.

Before corn sowing, the suspension agent was treated with 30% thiamethoxam seeds, and the seeds were dressed at a ratio of 1:200 300. Thiametoxam has good systemic properties and good stability in soil.

After being absorbed by the root system, the agent spreads to all parts of the ground to kill thrips that damage corn. The validity period can reach more than 60 days, which can not only prevent thrips damage, but also prevent aphid damage in the later stage. The operation is simple, labor-saving and time-saving, and the control effect is good.

It deserves to be heavily promoted.

Look** is a symptom of corn seedlings.

Soil phosphorus deficiency, corn seedling leaves, leaf sheath from green to red, and finally purple, generally in the corn 3 leaf stage symptoms, in 4-5 leaves the most obvious, the root system is not developed, the stem is small, slow growth, the leaves from green to purple, severe leaf death.

Phosphorus deficiency reduces the absorption capacity of roots and hinders chlorophyll synthesis, resulting in leaves turning from green to purple.

After the emergence of corn, if it encounters low temperature, it will often make the corn leaves turn red or purple, but with the increase of temperature, the phenomenon of red seedlings will gradually alleviate and disappear in the later stage.

In addition, low-lying water accumulation in the field, underground pest damage, soil too sticky, sowing too deep or too shallow, as well as improper fertilization caused by seedling burning, improper treatment of seedlings poisoning and so on will lead to red seedlings.

Prevention and control measures: increase the application of phosphate fertilizer as base fertilizer, generally apply 40-50 kg of superphosphate and rotted and fermented organic fertilizer per mu as base fertilizer.

For the purple seedlings that have appeared, foliar sprays can be applied 2-3 times with potassium dihydrogen phosphate.

FYI. Thanks for the good reviews!

Tacos. First, thrips, tea this Hui Huang mite caused by the harm.

Second, the physiological hazards caused by high temperature and drought in Sensuida.

Third, the wind in the shed is too fast, and the temperature difference between indoor and outdoor is too large.

Fourth, the harm caused by viral diseases.

Fifth, hormone drugs are harmful, and the symptoms are bending leaves or growth points.

Consider Curvularia cornis leaf spot.

Early sowing can avoid and escape the disease, thereby reducing the onset of the disease. The third is to increase the application of fertilizer. In addition to increasing the application of agricultural fertilizer, to increase the application of nitrogen fertilizer, where the soil layer is thick and strong, as well as fertilization, top dressing more plots, corn grows luxuriantly, the general incidence is relatively light, heavy application of nitrogen fertilizer can reduce the incidence of more than 30%.

The pesticide control can be treated with 70% mancozeb wettable powder, or 70 grams of 50% antibacterial special wettable powder, plus 30 grams of Heguoli wettable powder, mixed with 30 40 kg of water spray. 7 spray 1 time in 10 days, spray 2 3 times in a row.

FYI.

Under normal circumstances, the tolerance of corn itself is strong, and when there is slight damage, it does not need to be treated, and the growth of corn is only temporarily inhibited, and it can be recovered after 7-10 days, and will not affect the yield. If the damage is serious and needs to be treated, the following measures can be adopted:

1. Even detoxification: Take measures to detoxify as soon as possible. For the initial damage on corn plants, spraying water 3-5 times can be used to wash off the pesticide residues on the plants.

2. For the corn that is more harmful and has a curling heart, tear the onion leaves by hand to let the corn draw the male normally.

3. Spray Dongzhou Fuxing (re-acting phenol sodium + plant cell activator) diluted 1500 times or gibberellin plus 1 urea aqueous solution in the morning after the dew dries or in the evening spray the front and back of the leaves to promote the normal growth of the plant and effectively reduce the damage.

4. Strengthen field management: water enough water to promote the corn root system to absorb a large amount of water, so as to reduce the concentration of herbicides in the plant and alleviate the damage. Combined with watering, ammonium bicarbonate, ammonium nitrate, urea and other fast-acting fertilizers were applied to promote root development and regeneration, restore the physiological function of the damaged maize, and reduce the damage of nicosulfuron damage to maize.