The main reason for poor efficacy of medication
Seed treatment rate before sowing is low. Seed treatment with seeds is the most effective measure to prevent and cure wheat sheath blight, but the production is far from the requirement that the seeds are not coated (not treated with medicaments).
There is little prevention in the fall, and the actual production in the late spring is ignored in the actual production, and the control period is missed in the later period. Early wheat in Xuzhou is generally sown at the end of September and early October. Late wheat is sown in the middle and late October. After the emergence of wheat, the pathogens infect the seedlings and form the peak of infection, but the hazard is not obvious, and it is easy to ignore the prevention and control in production. In the spring of the following year, the growth of wheat turns green, and the bacteria gradually invade and reproduce. The common prevention and control time for production is from late March to early April. Rhizoctonia at this time developed rapidly, combined with the large plant type of wheat, a waste of liquid medicine, control effect was affected.
Insufficient liquid medicine can not fully wet stems and leaves of wheat stems and roots, which greatly affect the control effect. The farmer's application of pesticides is basically carried out with a pressure-bar-type manual sprayer. Generally, 30-40 kg per mu are sprayed, which is far less than the requirement for large-volume liquid sprays, and the sprays are sprayed on the upper middle blade and cannot be reached. The site of action, thus affecting the efficacy.
Key measures to improve efficiency
Strengthen seed treatment with 1.5% triazaol suspended seed coating agent for every 100 kg of wheat seeds, or licbuterol 6% tebuconazole suspension seed coating agent for 50-67 g, or 14% fluoxetazole seed coat 2 kg coated seeds.
Large amount of liquid medicine should be sprayed before application. Fields without seed treatment and heavily diseased fields should be sprayed before autumn. Spraying should be used for prevention and treatment in autumn. Early infestation of wheat should be performed in late October to early November. Late wheat and wheat should be in mid-November. Medication. You can use Sablechin 15% Jinggang Triadimefon WP 100 ~ 130 grams, add water 60 ~ 75 kg spray. The liquid must be sprayed onto the stem base of the wheat and the root soil. Spring medication should be in mid-March, pharmaceuticals with the autumn control, prevention and treatment of delay should increase the amount of liquid medicine, 100 kg per mu of liquid medicine, severe illness fields every 10 to 15 days and then spray once. In a certain range, the amount of liquid should not be too small.
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