Three defenses in wheat fields must be "three checks and three decisions."

Strengthening field management during the jointing stage of winter wheat is of great significance to the harvest of winter wheat. In the spring wheat field, one spray and three defenses are applied, that is, the task of weed control, disease prevention, and chemical control and prevention is completed at the same time. The main targets for prevention and control are chemical control of weedy weeds, sow weeds, leeks and annual weeds, grasses, and prevention of wheat powdery mildew and leaf rust. In addition, Wang Miao sprays chlormequats to prevent lodging in late growth stages. Three commonly used formulations are: 1 Tribenuronic 10% wettable powder 10 g (or 2,4-D butyl ester 72% EC 40-50 ml) + triadimefon 20% EC 50 ml (or 30% of hexaconazole) Agent 5ml) + paclobutrazol 15% wettable powder 40g/mu; 2 tribenuron-methyl 10% wettable powder 10g (or 2,4-D butyl ester 72% cream 40-50ml) + hexaconazole 30% suspending agent 10ml/mu (Note: Hexiconazole 30% Suspension 10ml/mu, both prevention and strong stalk anti-fall effect). The above formulas all require 30 kilograms of water. In spring wheat 1-2 leaves until the beginning of jointing, weeds should be sprayed evenly with a hand-pressure sprayer or sprayer. For the wheat fields with a population of 800,000 stems/mu or more, prosperous vegetation, and weeds, three preventions are to be carried out. Others, depending on the specific conditions in the field, should select the three defense agents and do a “three checks and three determinations”.

Check the total number of stems after winter to determine if it is down

After wheat turns green, the total number of stems in winter wheat fields is generally investigated in late March. If the total number of stems is more than 1 million stems/mu, we must prevent them from falling; in the case of 800,000 stems/mu or less, we should promote the formation of large stems and spikes, and do not need to fall down; between 0.8 million and 1 million stems/mu. In accordance with the field management situation, if there is a tendency to prosperous, it should be prevented. Wheat fields that do not need to fall, do not add 15% paclobutrazol WP.

Check the weed species and determine the type of herbicide

The type of weeds is the wheat field dominated by annual weeds such as sow wormwood and leeks. Tribenuron-methyl herbicide is used. Tribenuron-methyl has good effects on large plants with a plant height of 15 cm or more; annual weeds and grasses are used. In the main wheat field, 2,4-D butyl ester is used. This medicine has a fumigating effect and can kill the grass hidden in the lower part of the wheat plant. Fields without broad-leaved weeds in the field, without herbicides such as tribenuron and 2,4-D butyl ester.

Check weeds, wheat growth period, determine the three defense time

The weed control period is appropriate: the sowing wormwood and leeks are returned to green before jointing (the height is less than 10 cm), and grass is the cross period (two true leaves are completely unfolded). The optimum period of wheat three defenses: Chunsheng 1-2 leaves to the beginning of jointing (the plant height does not exceed 15 cm). According to the wheat growing period of weeds and wheat, determine the specific application time of the three defenses. If the unearthed grass is late, the three defenses should be divided into two steps, that is, the prevention and treatment should be carried out first, and then the grass should be controlled. For wheat fields where there is no prosperous growth and no weeds occur, it is sufficient to prevent diseases. At present, most varieties of wheat planted in the city are more susceptible to powdery mildew and more resistant to rust. Once the conditions are suitable for the epidemic, prevention must be done. Spring prevention is the most economical and most convenient method.

Precautions:

(1) It is good practice to use the medicine in a sunny day and exceed the level 3 wind.

(2) Herbicides 2,4-D are fumigated and highly mobile and sensitive to broad-leaved crops. The prohibition of the use of broad-leaved crops such as melons and cottons around the wheat field may allow the use of tribensulfuron, which has a small amount of drift, to prevent phytotoxicity.

(3) It is forbidden to use motorized sprayers for spraying herbicides and protective agents. The application amount of the motorized sprayer is influenced by multiple human factors such as the walking speed of the sprayer, the height of the spray bar, the angle of the spray bar, etc., which can easily result in inconsistent doses of the drug, resulting in partial ineffectiveness and localized damage to the drug.

(4) It is forbidden to use 2,4-D butyl ester and paclobutrazol after jointing. The use of 2,4-D butyl ester after jointing, easy to form abnormal ear, increase the number of infertile spikelets, affecting yield. The principle of paclobutrazol prevention is to shorten the internode length of 1-4 basal segments and increase the elasticity of culms; after the jointing, no anti-backup effect is used, and spikelets are easily formed, resulting in reduced production.

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