For more convenient reading, for information about agricultural technology, please click on my avatar to follow me. During the growth process of corn, new leaves cannot spread normally, and deformed leaves appear. Some look like ox tails, and the growth of corn is obviously severely inhibited. If not timely prevention and control is carried out, such corn plants will not be able to form corn cobs in the later stage, and some corn will spread outward. This phenomenon mainly occurs during the corn seedling stage, which is also one of the main diseases and pests of corn seedlings. There are generally several main reasons for the twisting of corn seedlings:
1, the hazards of file-sucking pest thrips . Corn twisting often occurs in the corn seedling stage. Thrips are small in individuals and have hidden actions and are not easily discovered. Thrips are hidden in the corn heart leaves. Nymphs and adults both suck juice in the corn heart leaves. After the corn growth point is damaged by pests, the leaves cannot stretch normally, and the victim leaves are green and yellow. The victim parts of corn leaves stop growing, and the victims continue to grow, forming a leaf-enclosed "twist" shape, which is also likened to "whip-shaped". In severe cases, it will cause heart leaves to rot.
Thrips like drought and dry weather, and do not like rainy weather, which is what we often experience. In which year, there is more rain during corn growth, which is conducive to the growth of corn seedlings. The harm of thrips is very light. When the corn seedling period encounters drought weather, it is beneficial to the squatting of corn seedlings, but it is also beneficial to the reproduction hazards of thrips. The pseudopupa or nymph of thrips can overwinter in weeds outside the field, in cracks in the soil, under dead branches and leaves, or indoors in greenhouses, and will cause harm when the temperature is appropriate in the second year.
2, spray herbicide excessively, the amount of herbicide used for weeding in corn fields is large or sprayed into the heart leaves, causing damage to the heart leaves of corn. The corn seedlings have 4 to 5 leaves, and the ability to resist herbicide is the best, especially when spraying herbicide too late, the time when the corn seedlings have the strongest resistance to herbicide has passed. I did not pay attention to avoiding corn cob , causing damage, causing deformation and distortion of the corn heart leaves.
3, Early symptoms of corn top rot , corn seedlings grow and suffer from pests and rot, and also show distortion and deformation of leaves in the early stage of the disease.
4, Methods for preventing and controlling corn twisting:
(1) Timely prevent and control thrips. First, destroy the wintering places of thrips, reduce the source of insects in the second year, and promptly interstitially determine the seedlings of corn seedlings, remove the weak and retain the strong, remove the pest and harmful seedlings, and then spray the medicine to prevent and control thrips in a timely manner. To avoid excessive drought in the soil, you can use 1500 times liquid thiamethoxam, 1000 times liquid pyramidone, Avi minus nitrile 1000 times liquid for prevention and control. When spraying pesticides, try to choose around the evening or early morning, because thrips have the habit of hibernating at night. To improve insecticide effect, 1000 times liquid high-efficiency cypermethrin can also be added.
(2) Spray herbicides in corn fields and use them strictly in accordance with the operating procedures of the herbicides. Do not increase the dose at will or change the spraying method. When the herbicide is strongest, spray the relevant herbicides when the herbicide is strong. After the 5th leaf stage, spray the herbicides. Avoid the corn heart leaves.
(3) Prevent and treat diseases. Corn top rot is a fungal disease. In the early stage of the disease, spray 800 times liquid methyltobujin + 1000 times liquid dysen zinc in time. Okay, that’s all for today’s sharing. Welcome to follow. Friends who like it will like it before leaving.
