Herbicide herbicide damage in wheat field

In order to avoid the risk of phytotoxicity, the editors listed the precautions for herbicides that are commonly used in production and are prone to phytotoxicity for the user's reference.

1 Acetochlor. After sowing, wheat is sowed with acetochlor or its compound preparation (such as acetochlor). After 3 to 4 days of drug exposure, more than moderate rainfall will occur. The seedlings will inevitably appear incomplete or not emerge, and should be used with caution before sowing. .

2 Isoproturon. The application period is relatively wide, and it can be applied from before seedling to before jointing, but the best weed control effect is from the pre-emergence to the 3-leaf stage. Severe frost weather occurs within two weeks after the application of isoproturon, which may cause heavier damage to wheat that has not been subjected to low temperature training. The wheat seedlings may show chlorosis and growth inhibition. Severe frosts occur shortly after application and the wheat is more severe and may even die. The application of ipratropium and its compound preparations in wheat fields generally requires that the daily minimum temperature below 0°C does not occur within 1 week after application.

3 methylsulfuron. After application, certain wheat varieties may have temporary yellowing or dwarfing in the early growth stage. Generally, the yellowing phenomenon will disappear after returning green. If the amount exceeds the standard, improper application may cause serious injury, and the damaged wheat seedlings may grow yellow and grow. Suppressed, severe dry dead seedlings. After the over-application of the spring in the spring, the wheat seedlings can not resume growth for a long time, which will seriously affect the ear differentiation and timely heading of the wheat, so the spring application should be more cautious.

4 Clodinafop-propargyl. When the amount of active ingredient per acre reaches 135 g, it will have a significant inhibitory effect on the growth of wheat seedlings, but the wheat seedlings can recover quickly afterwards. If the temperature is low after application, especially in the case of continuous cold temperatures and large temperature changes, phytotoxicity is more likely to occur. The growth of wheat seedlings was inhibited, and even after some years of application of clodinafop-propargyl esters in winter and spring, the wheat leaves after application were yellowed, which led to a large number of dead seedlings.

5 Fluroxypyr. Safer broad-leaved weed herbicides, in drug-resistant plants such as wheat, can be combined with conjugates to lose their toxicity and thus be selective. However, the blind increase in the amount of medication is prone to phytotoxicity. Symptoms usually appear 2 to 3 days after application. Wheat is mainly yellow, and the plants are deformed and distorted. For example, if 200 g/L of 450 mg chlorofluoropoxyacetic acid is used per acre, it may cause serious injury to wheat. Even die seedlings appear. Therefore, it is generally safe to use a dose of 50 ml to 70 ml.

6 2 A 4 chlorine. Before the 4-leaf stage of wheat, 2A and 4 chlorine were used, and it was prone to phytotoxicity, forming onion tube leaves. The use of wheat after jointing, it is also likely to cause late leaf curling onion, ear deformity.