Many provinces and cities in China are about to enter the sowing date. The seed dressing of wheat in the sowing period can effectively reduce the incidence of wheat seedlings. The prevention and control techniques of diseases, pests and weeds in autumn seedlings are as follows:
First, to prevent root sheath diseases such as wheat sheath blight and total erosion. Autumn seedling stage is the first infection peak of the above-mentioned diseases, and prevention at this time can have a multiplier effect. It is suggested that the land of wheat sheath blight, full-bleeding disease and other diseases occurred in recent years. Use 12.5% ​​of diniconazole WP or 15 to 20 grams of 15% triadimefon WP per acre, and 40 to 50 of water. Kg, Shun Mai ridge spray seedlings to reduce the incidence of the coming year.
Second, control of powdery mildew, rust and other leaf diseases. When the diseased plant rate reaches more than 10%, it is recommended to use diniconazole, triadimefon and other agents for spray control, especially for wheat stripe rust prevention and control to take "drug investigation, discovery, control a piece of" control measures, The disease is controlled at the beginning of the disease.
Third, control of wheat aphids, wheat spiders, aphids and other pests. When the planting rate exceeds 5% and 100 plants have reached 20 or more, 50% anti-indoles or 10% imidacloprid spraying should be used. When the length of wheat spiders on a single row of ridges reaches 50 or more, avermectin and peony may be used for spraying. For each square meter of earthworms and earthworms that have 5 heads, and 10 or more cornfieldworms, they should be immediately treated with medication.
Fourth, reduce the underground pest base. When the wheat field due to the death rate of deadly soil pests reaches 3%, immediately use 40% phoxim EC or 40% methylisotriphoris EC 200-250 ml per mu 2.5 kg water, mix fine dry soil 30 to 35 kg mix Even, Shun Mai ridge application control.
5. Pre-winter weed control techniques in wheat fields. The best prevention and treatment period of wheat field weeds in the 3 to 6 leaf stage of winter wheat seedlings, broadleaf, grass weeds 2 to 5 leaf stage, the basic Qimiao. For the control of broadleaf weeds such as SVW, Laverna, Maijiagong and Bristles, 10% tribenuron-methyl WP can be used for 10 g per mu or 75% tribenuron-methyl for 1 g per mu. Watered 30 to 50 kg of spray; also can choose 72% 2,4-D butyl ester EC 50 ml per mu, watered 40 to 50 kg spray. For mixed weeds, use 50% of 25% tricfone EC 39 ml + 50% acetochlor EC.
When applying pesticides, pay attention to:
First, the use of 2,4-D butyl ester must use special equipment, while spraying should pay attention to prevent the liquid from drifting to other nearby crops to prevent phytotoxicity.
Second, on the basis of the correct choice of herbicides, strict control of the dosage, the optimal application period, and the temperature and humidity requirements of the pesticide application. General application in sunny days and no frost and heavy rain in 4 days, good light at noon, temperature of 10 ~ 20 °C best to use, within 4 hours can be basically absorbed, the minimum temperature when medication is generally not less than 6 °C, to avoid the impact of low temperature Efficacy and produce phytotoxicity.
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