The cold temperature of wheat caused by meteorological factors is one of the main causes of dry wheat ear. The cold-tolerance ability of wheat during the jointing stage of rejuvenation is poor. Temperatures below 0°C or long-term low temperatures can lead to the frozen or deformed wheat ears, which can also result in undergrowth in the upper part of the wheat ear, which in turn leads to no heading or dry ear in later stages. Too high a temperature will cause a large amount of water to evaporate from the wheat plants, resulting in imbalance of water in the body. Preventive measures: Use varieties with strong cold resistance for proper sowing. Spring varieties cannot be planted too early; late sowing can enhance their cold resistance; reasonable fertilization, improved sowing quality, and enhanced water management can all increase the cold resistance of wheat seedlings; Appropriate spraying of 0.3% potassium dihydrogen phosphate and other foliar fertilizers in the middle and late stages of wheat growth can enhance the plant's resistance to stress. Immediately after the occurrence of frost damage remediation.
Disease sheath blight, head blight and full-bleeding disease can all lead to wheat withered. Rhizoctonia solani mainly damages the sheaths and stems of wheat. After the temperature rises in spring, it is the peak period of disease. When the temperature rises, the pathogen infects the stems and destroys the transporting tissues, leading to dry and white spikes. Fusarium head disease mainly affects the wheat ear, and when the weather is wet, the pink wheat mold layer is formed at the joint of the wheat spikelet or at the base of the spikelet. When the climate is dry, the wheat ear is inhibited by the disease. Full-bleeding mainly damages the roots and base of stems. The mildly diseased plants at seedling stage are short-growth and yellowish. The primary roots and stem bases turn grayish black, and when the roots become severe, the roots become black, causing the slow turn of wheat, slow growth, and maturity. The symptoms are particularly obvious, with severe rot in the base of the stem of the diseased plant, and the ear of the disease plant is withered. Preventive measures: Use varieties with better disease resistance and use fungicides to prepare seed dressings. Fields with heavy culprits that are severe all year round can be seeded with thifluzamide, etc.; sowing can be done in a timely manner to ensure proper close planting and balanced fertilization; In the period of wheat returning to jointing, bactericides such as diniconazole and tebuconazole can be sprayed to control sheath blight and other diseases. The disease should be sprayed once every 7 days or so; care should be taken to prevent head blight in wheat from heading to flowering, in case of continuous rainy weather. Spray should be sprayed in advance or in a rainy place.
Underground pests, helminthidae and cockroaches, are the main underground pests that cause wheat withered ears. The ground temperature of spring wheat gradually rose at the jointing stage of the spring, and the ground pests began to float to the roots and underground stems where erosion hazards occurred, resulting in empty stems and root rot, and the formation of withered spikes after heading. Alum also snaps off the roots of the seedlings, causing the seedlings to die. Plants that are harmed by underground pests are often easily removed. Preventive measures: Use phoxim and soil for soil preparation before planting. When the soil pests are in danger during the growth period, use phoxim to spray wheat stem base or apply toxic soil.
The wheat withered stems caused by the injury caused by pesticides and phytotoxicity mainly occur at the top of the ground and appear as patches of low-dry and white spikes. The roots and stem bases of such plants often grow normally. It is only because the farmers are accustomed to dispensing medicines in the land and the liquid has not been shaken. Or leakage caused by excessive local drug concentration or liquid spray caused by. Should pay attention to uniform application, not heavy spray, no leakage spray.
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