With the growth of wheat, weeds in the field are beginning to emerge this season. It is time for farmers to start the field activity of weeding. This activity of weeding seems very simple, but in fact there are many trivial points to note. We must pay attention to the weeding time of wheat, the medicine used for weeding, and the specific medication according to the actual weed situation.
The effect of weeding before winter is greater than that of weeding in spring. There are two key time points for weeding in wheat: one is in the wheat seedling stage (about 3~4 leaves of wheat, 2 leaves 1 heart~3 leaves of weeds), which is the period before winter Time (from mid-to-late November to early December); the other is until the wheat turns green and before jointing (approximately late February to early March).
Mid-to-late November, just in the wheat seedling period, is the best time to weed the wheat. The weeding effect is the best, and the cost is the least!
Why is it recommended that everyone must focus on weeding before winter? Because under normal circumstances, from the emergence of wheat seedlings to overwintering in normal wheat fields, weeds will have a peak period of emergence, when the number of weeds emerging from seedlings accounts for more than 75% of the total weeds in wheat fields. Moreover, at this time weeds are in the seedling stage, with small plants, few roots, young tissues, sensitive to herbicides, and relatively good control. In the case of early spring control, the grass age of the weeds is relatively large. After a winter of low-temperature seedlings, the weeds are relatively resistant. The seemingly small weeds have already developed root systems and are difficult to control. It is necessary to increase the amount of medicine used, and this will increase the cost of medicine virtually. At the same time, it is also easy to cause phytotoxicity, so special attention should be paid when applying the pesticide in spring.
Therefore, the best application time for wheat should be mid-to-late November to early December, and late February to early March is mainly a supplementary application time.
Which weeds should be the key to selecting control agents based on the types of weeds?
If the environmental conditions such as temperature and humidity before winter are suitable, both gramineous weeds and broadleaf weeds will emerge. Both types of weeds need to be protected. If there are fewer broadleaf weeds before winter, It is necessary to focus on the prevention and control of broad-leaved weeds after the beginning of spring.
Therefore, in terms of medication, specific medication should be used according to actual conditions.
For wheat fields dominated by brome, you can choose to spray with flufentrazone or fluazuron.
For the malignant weeds in wheat fields-Jiejie wheat, we still choose to spray with mesosulfuron-methyl as the main ingredient.
For wheat fields dominated by broad-leaved weeds (Artemisia sowing, shepherd’s purse, quinoa), you can choose diflufentrazone or dimethyl tetrachloride, carfentrazone, tribenuron-methyl (many weeds have been resistant to it Severe sex) spraying. In addition, for broad-leaved weeds, you can use carfentrazone (a new type of compound), and the effect is good according to practice.
For wheat fields that are dominated by pigs, you can choose fluroxypyr or difluoro. As pyrenpyramine, fluclopyridine, carfentrazone or bensulfuron-methyl can also be selected.
For wheat fields with gramineous weeds and broadleaf weeds, you can choose to mix the above-mentioned agents for controlling different weeds, or choose a compound containing the above-mentioned ingredients. For example: metsulfuron-methyl + clodinafop + diflufentrazone, or spraying flufentrazone + metsulfuron-methyl + diflufentrazone + dimethyltetrachloride sodium, etc.
Pay attention to these points when spraying herbicides:
(1) When spraying, the daytime temperature should be higher than 10℃. It is not recommended to use the medicine under low temperature conditions, and it is forbidden to use it below 0℃. Under the premise of suitable temperature, the application should be selected after 11 noon to 4 pm in the windless weather.
(2) Strictly follow the recommended dosage and do not increase the dosage without authorization to avoid phytotoxicity.
(3) Pay attention to dry soil moisture. When the soil is relatively dry, it is necessary to water before applying the pesticide to ensure the effectiveness of the herbicide. Because most herbicides require a certain amount of soil moisture to exert their efficacy, soil moisture at 40% to 60% is most conducive to the efficacy of herbicides. However, it should be noted that if there is low-lying water, you can not use the medicine to avoid phytotoxicity.
(4) The second dilution method must be adopted for spraying.
(5) Mesosulfuron cannot be mixed with 24.D butyl ester and carfentrazone.
Now is the best time to weed the wheat fields before winter. Farmer friends should seize the opportunity and take action!
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