In March, the temperature climbed and wheat in all parts of China gradually entered the greening period. In the past few days, the reporters have successively received calls from Henan, Shanxi, Gansu readers and Mr. Wen from Sanyuan County, Shaanxi Province, reflecting that there are small yellow spots on the local wheat leaf sheath, brown streaks at the base of the wheat seedlings, and the stems of the wheat seedlings are broken and dead. On this issue, the reporter interviewed Chen Xinhong, an associate researcher at the Agricultural College of Northwest A&F University. He said that these problems are all diseases of winter wheat, for different reasons, or because wheat has sheath blight, root rot, leaf blight, etc. Or because of freezing damage, farmers should strengthen their attention, correctly distinguish and reduce losses.
Sheath blight The disease mainly occurs on the sheath and stem, and the root system is generally unaffected. In the early stage of the disease, small yellowish spots were first formed on the wheat leaf sheath near the ground, and then developed into a typical yellow-brown fusiform or cloud-like, eye-like lesion. The lesions gradually enlarge and the color becomes darker, causing the basal internodes of the diseased plants to rot. In the case of this disease, you can use Jinggangmycin (or epoxiconazole) + benzoyl propiconazole + brassinolide (or Bishen) + potassium dihydrogen phosphate spray, according to the incidence and growth of the seedlings, spray Apply 3 times, spray once every other week.
The root rot wheat was damaged after sowing, and the young shoots were damaged by brown marks and rotted in severe cases. There are also root damage, brown or black lesions, less roots, brown streaks at the base of the stem of the plant, and severe stems that die. It can be sprayed 3 times according to the severity of the disease and the growth of the plant by using metalaxyl or chlorfenapyr or carbendazim + benzylpropionazole + brassinolide (or Bishen) + potassium dihydrogen phosphate. Spray once a week.
Leaf blight The disease is mainly caused by leaves. In the early stage of the disease, there were nearly round chlorotic spots on the leaves, which gradually expanded into long oval or elliptical lesions, and the lesions were brown, and finally developed strips or irregular lesions. The center of the lesion is dark brown eyes, surrounded by taupe to dark brown, and the lesions extend along the veins, forming a long line of necrosis. Later, two or more lesions can be combined into large lesions, resulting in leaf dryness. If found, immediately spray with diniconazole or difenoconazole or iprodione + thiophanate-methyl or carbendazim + brassinolide + potassium dihydrogen phosphate.
In addition, the above symptoms appear in winter wheat, or freezing damage occurs. In the wheat field where the death of the whole field is serious, other crops can be considered for replanting; the main stem and tiller are not dead, and the wheat field with severe frostbite is on the sunny day from 11:00 to 2 pm, and the temperature is above 10 °C, spraying the brassinolide + Potassium dihydrogen phosphate; after the temperature rises, the night temperature reaches 2 ° C or above, timely watering and fertilization; the wheat field with less frost damage or partial frostbite, spraying brassinolide + potassium dihydrogen phosphate, returning green fertilizer water according to normal management, Minimize losses.
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