With the warmer weather, pests, diseases and weeds in wheat fields began to recover, multiply and harm. According to the investigation of the plant protection station of the County Agriculture and Animal Husbandry Bureau, at present, broad-leaved weeds in the county are mainly S. sophorae, amaranth, and wheat grass. Generally, there are 1-10 strains per square meter, with an average of 8.6 strains. 82 plants per square meter; Maijiagong and Bristles occur in individual plots; Wheat field grasses and weeds dominated by wheat and bromegrass, and the area of ​​occurrence is further expanded. The average land mass per square meter 2.8 strains, 55 blocks per square meter in severe plots. Wheat disease is mainly sheath blight, with a disease rate of 16.6%. The general disease rate is 3% and the highest is 10%. Wheat spiders are heavier in some wheat fields, usually 24 heads per meter, and severe 90-120 heads per meter. At present, it is a critical period for the prevention and control of diseases, pests and weeds in wheat fields. The corresponding control measures should be taken in time for different types of wheat fields to ensure the safe and high yield of wheat.
First, prevention and control measures
1. Weed control measures. In the autumn, wheat fields controlled by weeds are used, and the number of weeds is less than 5 plants per square meter. Without chemical treatment, artificial removal can be performed. In wheat fields where weeds are not controlled, the number of weeds exceeds 5 plants per square meter and chemical control is required. In addition, control of broad-leaved weeds in wheat fields, must be completed before the jointing of wheat, mu can be used 10% tribenuronic-methyl WP 10g plus 13% 2 A 4 sodium chloride water 200-300 ml, 30 kg water Spraying; For grass weeds, we should adopt methods such as scratching and manual removal. Before the heading of wheat, pull-net treatment should be adopted. To avoid leakage of land and leave no dead ends, no chemical control can be conducted to avoid injury. .
2. Pest control measures. For sheath blight and wheat spiders, severe land masses are subject to chemical control. For the control of sheath blight, use 12.5% ​​of diniconazole WP for 20-30 grams, or 5% of Jinggangmycin for 150-200 milliliters for 30 kilograms of water. The control of wheat spiders can use 30-50 grams of 4% bifenthrin microemulsion or 50-60 grams of 20% malathione emulsifiable concentrate to spray 30 kg of water. In the case of a mixture of pests and diseases, one of the above-mentioned insecticides and a fungicide mixture spray should be used to treat both diseases and insect pests simultaneously.
Second, the matters needing attention
1. The spray should be even and thoughtful, use the dose strictly, and the amount of water should be enough so that the spray is not heavy.
2. In addition to strictly controlling the use of wheat after turning green before jointing.
3. Spray equipment should be strictly cleaned.
4. Spraying should be done when there is no wind on sunny days and there is no dew.
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