Most of the weeds are unearthed after the fall of 3 leaves in autumn, and the grass is poorly resistant to chemicals. It is a favorable opportunity for chemical weeding. One control can basically control the wheat field damage, and it has little impact on the crops. It is necessary to seize this favorable opportunity to carry out chemistry at the right time. weeding.

In recent years, weeds in wheat fields have become heavier and the community has undergone major changes, especially in grasses and resistant dicotyledonous weeds in local plots, which are difficult to control. For wheat fields dominated by dicotyledonous weeds, 1 g of 75% bensulfuron-methyl dispersible granules or 10 g of thiasulfuron-methyl WP can be used to control the wheat field, which is resistant to dicotyledonous weeds. It can be controlled by using 20% ​​chlorofluoperoxyacetic acid (bringing it) emulsifiable concentrate 50-60 ml or 5.8% difluoro-oxazolamide (Maixi) emulsifiable concentrate 10 ml. For monocotyledonous weeds weighs 5% with 3% methyl disulfuron (Shima) EC 25-30 ml or 70% flurazepam (彪虎) water dispersant 3 to 5 grams, stem and leaf spray Prevention and treatment. A wheat field in which dicotyledonous and monocotyledonous weeds are mixed can be used in combination with the above agents. In order to prevent the occurrence of phytotoxicity, the following problems should be noted when chemical weeding:

First, use it strictly according to the recommended dosage. Second, it is necessary to ban or avoid the use of medicinal agents that have phytotoxicity to the crops. The long-lasting herbicides chlorsulfuron and metsulfuron are easy to use in crops such as peanuts and corn after being used in wheat fields, and should be banned. Dicotyledonous crops are highly sensitive to 2.4-D butyl ester, which is easy to cause phytotoxicity. Wheat fields such as wheat peanuts and wheat vegetables should avoid the use of 2.4-D butyl ester and herbicide containing 2.4-D butyl ester component for weeding.

In recent years, the hazards of underground pests on wheat seedlings have increased, and timely attention should be paid to prevention and control. Generally 50% phoxim emulsifiable concentrate can be used in 40-50 ml per mu or 40% chlorpyrifos (chlorpyrifos) emulsifiable concentrate 50-60 ml per mu of sprayed straw base, or 5% granules of the above two agents can be 1.5 per acre. ~ 2.0 kg after the application of watering. Soil and earthworms can be severely treated with 50% phoxim emulsifiable concentrate 1000 times to ensure safe growth of wheat seedlings.

In addition, it is necessary to pay close attention to the occurrence of major diseases and insect pests of wheat such as spider mites, ground tigers, wheat stubble, Laodelphax striatellus, sheath blight and total eclipse, and timely forecast and comprehensive prevention and control work.