In the past few days, the wheat leaves have been concentrated in various places, and the degree of the local crops is different. However, the degree is different, but some farmers are very anxious. Some people suspect that the spraying is improper, some suspected what the disease is, and the farmers who consulted. Much. Specifically, the dry tip of wheat that appeared in these days is actually caused by chilling damage. It is caused by the cold damage caused by the cooling on April 4-6. But then again, most of the wheat grown in the region are winter or semi-winter varieties. It is reasonable to say that the short-term low temperature at this time will not cause wheat frostbite. So some of the older farmers said: "The wheat is like this every year. Kind, I have not encountered such a common cold and dry phenomenon after the Qingming!" What is the reason? Experts pointed out that this is due to the special nature of the climate this year. In the end, how special is the climate? According to the latest climate report of the meteorological department, the average temperature in late February this year is 2.2 degrees higher than in previous years. The average temperature in late March is 5.5 degrees higher than in previous years, and it is also high in early April. (The highest temperature in Huanghuaihai area reached 31 degrees on April 2 this year), which is rare in history! This climate has led to the emergence of wheat (most of the land this year is the first length of wheat), the leaves are young, and the sudden drop in temperature on April 5-6 caused cold damage to wheat. The most accurate interpretation of agricultural experts from the scientific perspective is as follows: In the second half of this year, the average temperature was 2.2°C higher than that of previous years. The average temperature in late March was 5.5°C higher than that of previous years. This is a rare climate in history, causing the wheat to grow in length and the leaves are young, and the temperature is lowered on April 5-6. The appearance of short-term light frost causes short-term frost crystals in the leaf cells (especially the tip of the leaf tip), and the cell structure is destroyed after the frost crystals melt rapidly, and the wall separation and cell membrane rupture occur, resulting in a large outflow of cell fluid. . Water-soaked frost spots appear on the leaves (like boiling water). As the sun shines and the temperature continues to rise, the frozen part loses water, causing the cell wall to rupture. The cytoplasm, organelles and other protoplasms are lysed and miscible, making the cell structure impossible. The reversal of the change, which means that the cell is dead, leads to the appearance of the dry tip of the upper leaves of wheat. So, will this chilling injury have a significant impact on the output in the future? From the anatomical point of growth point and combined with expert experience, it is concluded that the general degree of dry tip has little effect on the yield, and the dry tip is very serious. The photosynthesis may have a slight impact on the yield, but it can be sprayed. The adjustment agent plus foliar fertilizer measures to achieve improvement, and ultimately achieve an increase in production. Related links: There are many reasons for the yellow tip of wheat yellow leaves, and four aspects are coping! In the process of wheat growth, there will always be problems of one kind or another. The yellow tip of the yellow leaf is divided into four reasons. Different types are caused by different reasons. The classification is found to find the cause, and the symptomatic measures are taken in time to ensure the high yield. . 1. Wheat frost damage The freezing damage is characterized by yellowing of the tip of the wheat leaf, twisting of the tip, rolling up, and a few wheat fields are white and dry. The density of the crops is moderate, the population is reasonable, the growth is good, the water and fertilizer are reasonable, the wheat field is lightly damaged, the density is too large or too small, the growth is weak, the planting is deep, the soil is poorly planted, the freezing weight of the wheat field is low, the fertility level is low, the density is small, and the freezing damage of the low field is often Heavier. For the frozen wheat field, the field management should be strengthened, and the suppression, irrigation and foliar spraying should be carried out in time. The blue crystal code 25 g + Nongxi Xilesu 30 ml, or “Wheat Zhuanghan 3+2†can be sprayed in time. Spray 10 special products to promote the large number of spikes. 2. Wheat virus disease: The main viral diseases include wheat bush dwarf virus disease, yellow dwarf virus disease and yellow mosaic virus disease. Symptoms are similar. The first two are yellowing of the leaves and dwarfing of the plants. The leaves are chlorotic when the joints are affected, the leaves are bright yellow, the plants are slightly shorter or the diseased plants are severely dwarfed, and the tillers are clustered. The latter is marked by yellowing of the leaves and more prominent after spring returning to green. Wheat yellow dwarf, bushy dwarf virus disease is a disease transmitted by the transmission of the virus, the main poisoning insects are aphids, spider mites, Laodelphax striatellus, insects sucking wheat seedlings and leaves while transmitting viral diseases, affecting the normal growth of wheat, Once the disease can cause serious reductions in production, the sooner the disease is affected, the greater the impact on yield. The disease is contagious and harmful, and it is difficult to control after the disease. Therefore, prevention and treatment should be carried out sooner or later. However, wheat yellow mosaic virus disease is transmitted by diseased soil, diseased root residue, and diseased water, and can also be transmitted by juice friction and is a new type of disease. The selection of disease-resistant varieties and the removal of weeds in the field are an important measure; chemical control should be carried out with insect-repellent as the main means, using chemical coatings such as fludioxonil + tebuconazole + thiamethoxam or imidacloprid Pre-seed coating can prevent underground pests while controlling aphids, smut, root rot, and sheath blight, and increase seed production and eliminate the transmission of vectors. In addition, the study found that CITIC Mai 9, CITIC Mai 99, Qumai 16, Tai Nong 18, Shan Nong 28 have strong tolerance to some viral diseases, and can be scientifically selected according to local conditions. For the plots that have already occurred, morpholinium and copper can be sprayed in time to inhibit the virus from promoting growth. 3, wheat herbicide phytotoxicity After the wheat is used, the leaves of the leaves are partially chlorotic, yellow, deformed, and the leaves are dry and dry. Generally lighter will return to normal growth after 10-15 days. The main reasons are: (1) improper use of contact herbicides such as oxadiazon, causing chlorosis of wheat leaves; (2) The humidity in the field is small and too dry; (3) The second dilution or the amount of water used for the acre is less than 30 kg; (4) Overdose use or re-spraying. (5) Mistakes in the selection of herbicide varieties, etc. (6) Excessive use of corn herbicides in the upper sputum leads to excessive soil residues in atrazine. The phytotoxicity of wheat herbicides is related to the irregular operation of the applicators. The majority of farmers should actively learn the use of wheat field herbicides. To understand the variety of drugs, be sure to operate the specifications, master the time of medication, temperature of medication, water consumption, medications, medication methods and precautions to avoid phytotoxicity. After the occurrence of wheat herbicide phytotoxicity, spray the regulator and foliar fertilizer in time, blue crystal code 25g + Nongxi Xilesu 30ml, or "Wheat Zhuanghan 3+2" one spray ten anti-special products, Promote wheat growth and alleviate phytotoxicity. If you find a mistake in a short period of time, spray a large amount of water and rinse directly. 4, wheat red spider damage The control of wheat red spider can be used in combination with 1.8% avermectin + 5% quinone. This article's website: What is the phenomenon of the dry tip of the leaves in the wheat? Is the disease harmful or phytotoxic? Desk Mini Fans,Portable Mini Fan,Mini Fan USB,Mini Fan Cooler,Handheld Mini fan Ningbo Shuangtuo International Trade Co., Ltd. , https://www.nbst-sports.com