What are the latest control methods for wheat sharp eyespot?

Wheat sharp eyespot is a common disease in wheat-growing areas. It can harm wheat sprouts, stems and ears, and in the seedling stage it can directly cause dead seedlings. It is seriously harmful to wheat and can cause direct losses and affect yield. Next, we will discuss the occurrence, causes and symptoms of wheat sharp eyespot, and finally introduce specific control measures for the disease.

I. Infection symptoms

In the early stage of infection, it mainly harms the leaf sheaths and stems. It first develops on leaf sheaths very close to the ground, producing round or spindle-shaped brown lesions that keep expanding and eventually cause the stems to rot. Later, all leaf sheaths will be found affected, and the lesions appear cloud-patterned; when humidity is high, yellow or white mold-like growth develops.

II. Causes of the disease

It overwinters as mycelium and sclerotia in the soil and diseased tissues, and can develop throughout the entire growth period. It is generally severe in warm, humid weather, spreads rapidly and becomes epidemic over large areas. Early-spring infection is an important source of infection and must be controlled and eliminated to avoid an excessive base of inoculum and excessively rapid reproduction. It is severe in seasons with cloudy and rainy weather and insufficient light. When sowing happens to place the stem elongation stage in summer, the disease is severe.

III. Control methods

1. Seed selection

Choose varieties with strong adaptability and strong resistance, such as Huamai No. 7, Emai No. 6, Afu, Ji 84-5418, Yumai No. 10 and Yumai No. 13. These are all excellent varieties bred over many years of planting in major wheat-growing areas, are worth promoting for planting and provide a certain safety guarantee.

2. Appropriate sowing management

Sowing at the right time can reduce damage to a certain extent. Sowing somewhat earlier can let the stem elongation stage miss the hot, rainy climate, thus reducing the possibility of damage. Lower temperatures from early sowing in the field can inhibit pathogen reproduction. Be sure to remove weeds promptly to avoid them growing up and forming a closed canopy over the base of the wheat, which increases temperature and humidity and worsens the disease.

3. Chemicals

Before sowing, use B#li powder or 33% Wenmeijing (triadimefon plus carbendazim) wettable powder for seed dressing to disinfect the seeds and prevent them from becoming infected. Use 1 kg of seed plus 1.5 kg of seed plus 1.5 mg gibberellin to relieve the phytotoxicity after spraying; if you are in a hurry to sow, you can use it. At the stem elongation stage, use 10 grams of the active ingredient jinggangmycin per mu, or 6-9 grams of benzyl · propiconazole, to control the disease. In dense wheat fields where spraying cannot reach the roots, increase the amount of water used so the chemical flows down to the roots.

If such a disease occurs in the wheat field you planted, you can refer to treatment based on the weather at the planting site and the disease occurrence situation. I hope this can be of some help. For more wheat-related content, you can continue to follow updates and look it up yourself.