What is the reason why wheat leaves turn yellow and dry during the seedling stage?

Wheat has a wide range of uses and is present in all aspects of our lives. Currently, there are many areas where wheat is grown, but there are always some harms that may occur during the wheat planting process. Let’s learn why wheat leaves turn yellow and dry during the seedling stage.

1. Yellow leaves caused by sheath blight

Sheath blight is more common in winter and early spring. After the infected wheat is pulled out, ring-shaped yellow-brown or dark-brown spots will appear at the base of its stems. This disease is highly contagious and requires timely prevention and treatment.

For sheath blight, growers are advised to give priority to triazole fungicides , such as tebuconazole, propiconazole, and fluopicolide, when choosing pesticides . The effect will be better when used in combination with thiophanate-methyl.

2. Yellowing caused by root rot

Root rot has also become more common in recent years. The roots of infected wheat plants will show symptoms such as blackening, yellowing, drying, and rotting. It is recommended to use carbendazim or mechlorethamine for spray control, and amino acid foliar fertilizer and brassinolide can be added to enhance the effect.

3. Yellow leaves caused by viral diseases

Wheat virus disease is more common in northern regions. The infected wheat leaves turn yellow, the heart leaves curl, the plants become short in the later stages, and cannot produce ears normally.

For viral diseases, it is recommended to focus on prevention and spray pesticides in advance. It is recommended to use morphine·copper acetate, amino oligosaccharides, brassinolide·indoleacetic acid·gibberellic acid and amino acid spray. It is recommended to use it twice in a row during the peak period to enhance the effect.

4. Yellow leaves caused by underground pests

Underground pests, such as wireworms, will eat the roots of wheat, affecting its absorption of nutrients, causing the leaves to turn yellow, and in severe cases even causing the death of wheat.

For underground insect pests, it is recommended to use clothianidin and thiamethoxam to mix seeds in advance. If damage occurs in the later stage, pyrethroid insecticides such as highly effective chlorfenapyr and homeopathic cypermethrin can be used for flushing prevention and control, or high-efficiency compound combinations such as biphenyl·clothianidin, perchlorate·phoxim can be used.

5. Yellow leaves caused by frost damage

Low temperatures in winter may cause frost damage to wheat and yellowing of leaves. It is recommended that growers spray more nutrient agents, such as 50ml of amino acid foliar fertilizer , 50g of potassium dihydrogen phosphate, 5ml of 14-hydroxybrassinolide and pyraclostrobin spray, which can both prevent diseases and resist frost.

6. Physiological yellow leaves

Physiological yellowing of wheat leaves is mostly caused by environmental factors, such as temperature, soil moisture and incomplete return of straw to the fields.

For the prevention of physiological yellow leaves, it is recommended to use brassinolide to mix seeds before sowing to promote rooting and enhance the ability to resist adverse environments; during the growing period, resistance can be improved by spraying nutrient regulating agents such as amino acid foliar fertilizers, phosphorus and potassium fertilizers, and ammonium esters.

To sum up, when facing the problem of yellow leaves of wheat, farmers need to first identify the cause and then prescribe the right remedy. If you have any other questions, please leave a message.