Weeding in the wheat field before winter is more energy-saving, remember these three strokes

At present, most farmers are accustomed to using chemical herbicides to control weeds in wheat fields in the spring. In fact, chemical weeding is better before winter than in winter, and the operation is simpler and easier.


Chemical weeding before winter has the following advantages: firstly, the dosage is small and the cost is low. When weeding before winter, the small amount of weeds is small, the treatment is simple and labor-saving, and the cost of medicine can be reduced . Secondly, the coverage of weeds by wheat seedlings small degree, before winter wheat seedling unsealed ridge, small field canopy, weeds bare, with large Emulsion; control effect is good, young organization before winter weeds, resistant poor, can improve the control effect again; there It is high in the safety of the crops, and the Herbicide is used before winter. The decomposition time of the liquid is long, so the safety of the crops is high . Finally, the spraying efficiency is high. Chemical weeding before winter can solve the difficulty of walking during spring weeding. Spraying efficiency is low, quality is difficult to guarantee and so on. Therefore, we should vigorously carry out chemical weeding before the winter wheat field, laying the foundation for the harvest of the next year.


The specific operation method of weeding before winter:


   1. Choose the best prevention time. From mid- November to early December , wheat seedlings grow to 4 leaves, which is the best time for weeding in wheat fields. At this time, most of the weeds have just been unearthed, the drug resistance is poor, and the control effect is good. One application can basically control the weeds in the whole growth period, and the application time is small, the herbicide residues are small, and the impact on the post-crop crops is also small. However, when the herbicide is used at low temperatures in winter, the herbicide is obviously longer than the herbicide at high temperature, and it usually takes 12 to 15 days for the grass to appear. In the summer high temperature stage to control the foxtail of farmland, the whole field weeds will generally die within 5 to 7 days. Therefore, be patient after the medication, as long as the timing is well grasped, the liquid is sprayed in place, generally do not need to re-medicate.


   2. Strictly control the dosage. Water should be added strictly according to the dilution factor. Do not reduce the amount of water at will. When spraying, pay attention to thoroughness, uniformity, no heavy spray, no leakage, all weeds should be sprayed with herbicides, otherwise it will be in vain ; if the amount of herbicide is too large, it will cause phytotoxicity and pollution. It even has an adverse effect on the crops after the crop ; if the dose is too small, the effect on weed control is poor, and it does not play the role of weeding and wheat. Therefore, when the herbicide must be strictly controlled doses, generally acres dosage of 30 to 40 kg.


   3. Focus on the quality of spraying. When using herbicides, it must be carried out in strict accordance with the technical operating procedures. Due to the low temperature in winter, it is often accompanied by strong winds, which is not conducive to the exertion of the efficacy. Therefore, it should be applied at a relatively high temperature during sunny days. At this time, the physiological metabolism of weeds is relatively strong, which is conducive to the conduction of the medicament in the weeds, and it is easy to receive a better herbicidal effect. For example, after entering December , the wheat field is controlled by weeds ( spermazole ) , which is basically difficult to kill weeds, especially herbicides such as isoproturon, which cannot be used when the temperature is too low. It should be used when the temperature is above 10 °C. Spraying time too early or too late can also cause pesticides to fall into the ground, causing waste and polluting the soil. At the same time, the long-lasting herbicides chlorsulfuron-methyl and metsulfuron-methyl should be banned. These two pesticides are susceptible to phytotoxicity to the crops after use in wheat fields. ( Jia Youjiang )



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Diflubenzuron is a benzamide Insecticide used on forest and field crops to selectively control insects and parasites. Principle target insect species are the gypsy moth, forest tent caterpiller, several evergreen eating moths and the boll weevil.

1) Diflubenzuron is an insect growth regulator, disrupting the formation of the insect cuticle by chitin synthesis inhibition, therefore the application time is at insect moulting, or hatching of eggs.


2) It is used against a wide range of major pests including mosquitos, grasshoppers and migratory locusts. Due to its selectivity and rapid degradation in soil and water, diflubenzuron has no or little effect on the natural enemies of various harmful insect species.


3) The properties make it suitable for inclusion in integrated control programmes. It can also be used widely as animal health care medicament in Australia and New Zealand.


4) It can be control of a wide range of leaf-eating insects in forestry, woody ornamentals and fruit. Controls certain major pests in cotton, soya beans, citrus, tea, vegetables and mushrooms. Also controls larvae of flies, mosquitoes, grasshoppers and migratory locusts.


5) It also used as an ectoparasiticide on sheep for control of lice, fleas and blowfly larvae. Due to its selectivity and rapid degradation in soil and water, it has no or only a slight effect on the natural enemies of various harmful insect species. These properties make it suitable for inclusion in integrated control programmes.


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