Yellow leaf dry tip phenomenon in wheat? Eight aspects teach you how to prevent! (二)

4. Insufficient soil fertility

In the seedling stage of wheat, nitrogen fertilizer, potassium fertilizer and other macronutrient elements, or calcium, molybdenum, copper and zinc and other trace elements are insufficient, will cause wheat to turn yellow and dry. You can spray potassium dihydrogen phosphate + urea + trace element foliar fertilizer to supplement nutrition, improve the symptoms of wheat deficiency, and promote the normal growth of wheat.

5. Temperature changes

Drought in the seedling stage of wheat will cause dry tips and yellow leaves of wheat, which should be watered according to actual conditions.

The sudden drop in temperature in winter will cause the wheat seedlings to freeze, and the leaves will be like boiling water. The temperature rises in the later period and the injured leaves lose water, which will cause the upper leaves of wheat to appear dry tips. It is recommended to water antifreeze water in advance or spray the leaves. Apply potassium dihydrogen phosphate + brassinolide to prevent freezing.

6. Wheat root rot

Wheat root rot is a common fungal disease. The symptoms are mainly as follows: the roots are brown, accompanied by decay; the leaves are yellow at the beginning, and severely die in later stages.

The main factors for the occurrence of wheat root rot are: the seeds themselves carry pathogens; the invasion of pathogens in the soil with damaged roots; low temperature and rain are more prone to disease;

The following measures are recommended to prevent wheat root rot:

(1) Seed dressing should be carried out before sowing of wheat. Seed dressing agents can be carbendazim, difenoconazole, fludioxonil, etc., which are generally mixed with insecticides, not with microbial agents. , Prevent insects and diseases;

(2) Wheat planting should be timely, not too early or too late, prone to vigorous and weak seedlings;

(3) After the disease occurs, you can choose carbendazim, difenoconazole and other fungicides to spray, and add potassium dihydrogen phosphate + brassinolide to enhance wheat disease resistance and alleviate wheat yellowing.

7. Wheat sheath blight

Wheat sheath blight is an important disease that occurs in wheat. It has two high-incidence periods: the first is in the seedling period before winter and the onset of wheat is three or four leaves; the second is in the April and May of the year, which is the high-incidence period. .

Mainly speaking, in the first high-incidence period, the affected parts of the disease are mainly leaf sheaths in contact with the soil. The disease occurs near or slightly above the soil surface. The symptoms shown are dry wheat seedlings and rotten stems, which seriously lead to the base. The stem nodes rot and the whole plant dies.

For wheat sharp eyespot, it is recommended to spray in time before the onset of the disease. At this time, it is relatively good to prevent and control. You can choose trifloxacin tebuconazole or flusilazole or benzproconazole for control; Spray several times, with an interval of 7-10 days. When spraying medicine, you must get it through and don't take it lightly. While preventing wheat sharp eyespot, spray potassium dihydrogen phosphate per acre for foliar topdressing to improve wheat resistance.

8. Starscream harm

Red spiders harm wheat, the leaves turn white and gradually become chlorosis, causing wheat dry tips and yellow leaves. After the occurrence of red spiders, control must be carried out to avoid affecting the safe overwintering of wheat.

As long as the wheat is prepared meticulously, with sufficient fertility, and meticulous weeding, the occurrence of red spiders can be reduced. It is recommended to use abamectin, pyridaben, propargite, bifenthrin, hexythiazox, etc. after the occurrence of spider mites. According to the resistance of local spider mites and the cost of planting, choose the appropriate medicine, generally 5- Spray the medicine once every 7 days.

Zhengzhou Delong Chemical Co., Ltd. is a plant growth regulator production base in China, established in 2009, specializing in the production of plant protection products. If you have any questions, please feel free to contact us any time.