Since mid-June, precipitation has been widespread in most areas of Hebei Province, except in Tang County and several surrounding counties, where rainfall has been minimal, and high-temperature and drought persist. Due to the high temperatures and dry weather that affected the effectiveness of post-emergence herbicides, many farmers called to ask about the matter. In order to allow more farmers to use drugs scientifically and spray postemergence corn herbicides, we hereby make the following guidelines. First, spraying time due to the need for 2-6 hours of absorption process after corn seedling herbicide spraying, in these 2-6 hours, the efficacy is good or bad (that is, weeding effect is ideal) with air temperature and air The humidity is very close. In high temperature, dry weather in the morning, noon or afternoon, because of high temperature, strong light, the liquid quickly evaporates, the liquid will evaporate after spraying, and the amount of herbicide that enters the weeds is limited. The quantity is obviously insufficient, thus affecting the effect of weeding; at the same time, when spraying at high temperature and drought, corn seedlings are also prone to phytotoxicity. The best spraying time is after 6 o'clock in the evening, because the spraying, the lower temperature after application, the higher humidity, the longer time the liquid stays on the weed leaves, the weeds can fully absorb the herbicide The ingredients ensure the weeding effect. In the evening, the use of drugs can also significantly improve the safety of corn seedlings, and they are not prone to phytotoxicity. Second, the spraying method Mu dosage of water 15-30 kg, see grass spray, spray carefully, no grass to go, save time and good effect provincial drug. Third, look at the size of the grass spray When spraying corn seedlings after the herbicide, many farmers have a misunderstanding that the smaller weeds, the smaller the resistance, the grass easier to kill. Actually not, because the grass is too small to have a drug area, the weeding effect is not ideal. The best grass age is 2 leaf 1 heart to 4 leaf 1 heart period, when the weeds have a certain area of ​​drug, weed resistance is not large, weeding effect is significant. Fourth, corn seedling size corn postemergence herbicide best spraying time is 2-5 leaf stage of corn, corn resistance at this time is high, not easy to appear phytotoxicity. 5 leaves can be sprayed before the entire field, 6 leaves after the spray, to lower the nozzle, spray around the corn trees, to prevent liquid medicine caused by heart damage. 5. Maize varieties Since corn herbicides are mostly nicosulfuron, some corn varieties are sensitive to this ingredient and are prone to phytotoxicity. Therefore, corn fields grown from sweet corn, waxy corn and Denghai series cannot be sprayed. Application to prevent the occurrence of phytotoxicity. For new corn varieties, please try again. VI. Pesticide Mixing Problems Spraying of pesticides with organic phosphorus is prohibited 7 days before and after the spraying of the herbicide, otherwise it is prone to phytotoxicity. However, it can be sprayed with pyrethrins and carbamate insecticides. When spraying, care should be taken to avoid the leaves as much as possible and to prevent the liquid from pouring. This year, some of the cornfields in Sweden have serious flies and thrips. Controlling these two small pests can be done with imidacloprid or acetamiprid, but when spraying, do not mix with post-emergence herbicides, although imidacloprid or acetamiprid is not organic. Phosphorus, because the prevention and control of two small pests need to spray the heart leaf, if mixed with the sprayed leaf is prone to phytotoxicity, can be sprayed separately: spray herbicides in front of the seedlings, followed by imidacloprid or acetamiprid spray heart. VII. Resistance of Weeds Because of the high temperature and drought this year, weeds have their own stress resistance. In order to prevent the excessive evaporation of water in the body, the growth of weeds is not so thick, but grows gray and short. The actual grass age is not small (the so-called "small old man"). Most of these weeds are covered with small white fluff to reduce the evaporation of water. When pesticides are sprayed in this way, the liquid is topped by the small fluff on the surface of the weed stems and leaves. The weeds themselves absorb very little, which naturally affects the efficacy of the drug. Therefore, no matter what kind of drug is applied during high temperature and drought, it should be added. The amount of liquid sprayed (usually not less than 40 kg per mu) will not affect the efficacy of the drug. When farmers use pesticides, do not hesitate to take any medication.
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