Key Techniques for Preventing Pests and Weeds in Wheat in Early Spring

With the temperature rising, wheat is about to enter the period of re-green jointing. During this period, the prevention and control of wheat pests and diseases is to comprehensively prevent and cure wheat sheath blight, and scientifically supplement and treat weeds in wheat fields to prevent late spring.

1. Comprehensive prevention and treatment of wheat sheath blight and total rot disease

Integrated control of sheath blight should be based on the cultivation of disease prevention measures based on the comprehensive prevention and treatment measures for severe disease fields early spring supplemented with chemical control. When pouring water back to the green joints, topdressing with nitrogen and potassium should be followed, avoid partial nitrogen fertilizer, and increase plant disease resistance; timely cultivating after watering, early control of wheat field weeds, reduce field moisture; from late February to March In the first half of the year, when the disease rate of investigation was 15-20%, use 12.5% ​​of licorice WP 20-30 grams or 15% of triadimefon WP 50-100 grams or 5% Jinggangmycin water per acre. 150-200 ml of water and 50-75 kilograms of water are sprayed on the stem base of wheat, sprayed once every 7-10 days, and sprayed 2-3 times. For areas with full erosion, 15% triadimefon wettable powder 150-200 g water and 75-100 kg water are sprayed on the stem base of the wheat.

2. Scientific treatment of wheat field weeds

Wheat field weeds and wheat seedlings compete for fertilizer, compete for water and win light, which is one of the important factors affecting the normal growth of wheat. At present, wheat is in the period of getting green. With the recovery of temperature and improvement of soil moisture, weeds in some wheat fields will rapidly grow and spread. Failure to prevent and control them in time will inevitably affect the normal growth and development of wheat. Control methods: 1 cultivating and weeding; 2 post-crop crops for maize fields per acre with 75% tribenuron-methyl (commodity name cover width) 1-1.5 g or 10% tribenuronic-methyl WP 10 g (commodity Names: Maimai, Mackay, etc.) Uniform spraying of 30-45 kg of water; 3 Fields of broad-leaved crops such as peanuts or peppers can be selected with 15% of Tiisulfuron (Baohe, broadleaf powder) 10 Before the jointing season, 30-45 kilograms of uniform spray were mixed. 4 Control of grassy weeds such as wild oats can be sprayed evenly with 6.9% humic acid aqueous solution during the turnaround period of wheat return; the wheat field dominated by aegilops cerevisiae is sprayed with stem stalks with 30 g of 3% water dispersion granules; For serious cases of swine fever, 50-60 ml per acre is controlled with 20% of it.

3. Take measures to prevent cold spells

(1) Rational control: For wheat fields with population greater than 600,000, in the beginning of wheat, in the first three months of the month, 30 grams of 15% paclobutrazol per mu should be uniformly sprayed on 30 kg of water, and no heavy spraying or leakage of spray should be achieved.

(2) timely irrigation: timely irrigation before the onset of cold wave, can increase the moisture in the air near the ground, in the event of condensation, release latent heat, in order to reduce the ground temperature changes. At the same time, soil moisture increases after irrigation, the soil thermal conductivity increases, and the soil temperature increases. If cold damage occurs in early spring, it is necessary to apply fertilizer in time to remedy the problem.

(3) Foliar spray fertilizer: The wheat is planted and sprayed with potassium dihydrogen phosphate, desflurane or Shuofeng 481 and other plant growth regulators to promote the robust growth of plants and improve stress resistance. Foliar spray fertilizer can be combined with pest control.