How to control broadleaf weeds in sesame

Sesame is a dicotyledonous plant with small grain size and shallow soil when planting. Therefore, the herbicide must be strictly selected to avoid phytotoxicity. There are two ways to remove sesame seeds: one is to use drugs before sowing; the other is when the weeds are in the seedlings.

Pre-emergence closure: Due to the small size of sesame seeds and shallow sowing, a variety of closed herbicides are susceptible to phytotoxicity to sesame, and proper attention should be paid to the production. At the same time, pay attention to the weather forecast when applying the medicine. If there is continuous low temperature and high temperature in the field such as rainfall and cooling, it is also prone to phytotoxicity; because the strategy of sesame weed control is mainly to control the early grass damage, the sesame field grows high and dense in the middle and late stages. In the middle and late stages of sesame field, it has a good control effect on grass, so the amount of herbicide used in sesame field should not be too high.

Within 3 days after the sesame seeding, the crop was diluted with 96% metolachlor 70-120 ml or 48% alachlor EC 200-250 ml, diluted with water 30 kg, and evenly sprayed on the surface. Fields with heavy soil or rich soil organic matter should be appropriately increased. 33% pendimethalin emulsifiable concentrate, 100-150 ml/mu, evenly sprayed with 30 kg of water, can effectively control a variety of annual grass weeds and weeds, crickets, ramie broadleaf weeds, on the teethè‹‹ and shovel also have a certain control effect. When applying the drug, it is necessary to adjust the dose according to the conditions, and the dosage should not be too large. Uniform application should be applied in production, and should be tested and compared first, otherwise it is prone to phytotoxicity.

In addition, some farmers' friends used acetochlor for pre-emergence elimination, and most of the results showed phytotoxicity, resulting in no emergence or destruction. However, there are a few successful use. The successful measures are ditching and covering the soil with thicker soil (more than 1 cm). In short, it cannot be promoted and it is an unsafe drug.

Post-emergence chemical removal technology: For effective weed control measures in the early stage, chemical weeding should be carried out in time in the post-emergence period. The application period should be before the sesame seal line, the weed 3-5 leaf stage, with 10% quizalofop-ethyl emulsifiable concentrate 20-30 ml/mu, 10.8% high-efficiency flupirtine emulsifiable concentrate 20 ml/mu, 15% fine pyridine Fluoroxaline emulsifiable concentrate 50-75 ml/mu, 12.5% â€‹â€‹enephidineÂ·oil oil emulsifiable concentrate 50-75 ml/mu, 24% ketene 10-20 ml/mu, adding water 25-30 kg/mu into liquid medicine Choose to clear the rain after the rain, or spray it when there is morning dew. When the soil is dry, increase the amount of water used for dilution to improve the efficacy. These herbicides can be used to control grass weeds and are basically ineffective against broadleaf weeds. When the soil moisture is suitable and the weed growth is flourishing, the control effect is better.

At present, there is no safe agent for controlling broadleaf weeds after sesame seedlings and stems and leaves. For example, more broad-leaved grasses in the field should be treated with early soil closure.

Regardless of the control of grass weeds or broadleaf weeds, the following points should be noted in the application process: First, the soil moisture should be sufficient, and the application rate should be increased when the moisture is poor. Second, the soil with heavy soil weight should be increased appropriately. The amount of drug used; the third is to control stems and leaves weeds, to choose in the 3-5 leaf stage, the seedling age is longer to increase the dosage; fourth, the sesame field drug technology requirements are higher, all applicable drugs need to go through a small test Promotion.

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