Recently, many farmers in Jiangsu and Anhui reported the yellowing of wheat leaves. Combined with pictures and on-site investigations, the authors found that this year's wheat is seriously affected. The harm mainly comes from two aspects: First, natural disasters, and second, wheat diseases.
Cause Analysis
During the autumn harvest last year, due to continuous rain, rice harvest was generally delayed, resulting in delayed sowing of wheat than in previous years. In order to pursue output, farmers have to increase the amount of sowing, which results in a high density of fields, poor ventilation and light transmission, and is very vulnerable to natural disasters and pests. Since April 15th, heavy rains have frequently occurred in the Su Shi area, and the wind has been strong. The formation of unfavorable weather conditions for many years has been extremely detrimental to the growth of wheat.
The continuous overcast and rainy weather in natural disasters caused over saturation of soil moisture in wheat fields, poor soil permeability, and inhibited growth and development of roots. Many low-lying plots of wheat have black roots that are dead, causing waterlogging and yellowing of leaves. At the same time, the field cover caused the lower leaves to fall short of sunlight, adding to the yellowing of the leaves. The yellowed leaves of the stained wheat are uniformly smooth.
Wheat disease has caused various diseases of wheat yellow leaves in various regions in the near future. Attention should be paid to distinguish between them. One is sheath blight. Wheat sheath blight occurs frequently in high-density planting fields. Cloudy spots and even dead leaves appear in the lower leaf sheaths. Leaves do not receive water and gradually yellow and die. The yellowish blight caused by sheath blight is mostly spread upward from the base. The second is yellow spot disease. The strong winds in mid-April caused injuries to the upper leaves of wheat, followed by the infection with leaf blight pathogens, and the appearance of gray-brown lesions. The lesions gradually expanded and formed into one piece, causing the leaves to yellow and die. The yellowing of wheat caused by leaf blight is mainly the upper leaf, which extends from the tip of the leaf to the base of the leaf. The third is leaf rust. The occurrence of leaf rust in some plots of wheat this year is relatively serious, with a large amount of rust from the base leaves to the upper leaves. The surface of the leaves is rough, with red-brown spore powder. Yellow leaf rust caused by leaf rust is not all, uninfected parts are still green. The fourth is powdery mildew. Wheat powdery mildew first infects from the base leaves and gradually shifts upwards, infecting ears and even wheat. The ability of photosynthesis after blade compaction of white powder was greatly weakened, and unobtained wheat gradually died from yellowing. The previously infected wheat leaves were pinkish in color and yellowish brown in the later period.
solution
Yellow leaf problems in wheat can be diagnosed based on the above symptoms. If it is waterlogging, drainage should be conducted in time to reduce the humidity of the soil, promote the respiration of the root system, enhance the ability of the root system to absorb nutrients, and spray foliar fertilizer to enhance the photosynthesis of the leaves. If it is a disease, we must carry out targeted prevention and treatment according to the type of disease. For the control of sheath blight, fenoxastrobin, B. japonica, and benzocyclol can be used for the treatment of sheath blight, and wheat sheath blight gradually shifts upward during the middle and late stages of the crop. through. Prevention of yellow leaf blight, leaf rust, and powdery mildew, focusing on early onset or early morning after rain, use high concentrations of fine spray such as hexaconazole, acetaminophen, carbendazim, propiconazole.
In the wheat heading and flowering period, the combination of carbazole, fenproteril, clenbuterol, polyketone and other drugs can be used to treat the above diseases. In order to improve the control of head blight, continuous control of 2 to 3 times.
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