Keep in mind that these wheat herbicides use contraindications

Now when we have weeded the wheat fields in the home, all kinds of wheat herbicides will appear one by one, but when weeding wheat with wheat herbicides, it is easy to have phytotoxicity when we pay attention to it. Before the herbicide is used, Xiaobian first gives everyone Organize some taboos in some wheat field herbicides, and remember to apply them in your heart.

Wheat herbicide use contraindications

No herbicides before and after jointing of 4 leaves of wheat

Most of the wheat field herbicides are used after 4 leaves, and the drug is stopped at the jointing stage of wheat. Before the 4-leaf stage, the wheat is delicate, the detoxification ability and immunity are low, and it is easy to produce phytotoxicity. After the jointing stage, the wheat enters the booting stage, which is also the most fragile and critical period in life. At this time, the herbicide is very easy to produce phytotoxicity, especially It is 2 methyl 4-chloro, 2,4-titration ester, which sometimes causes the wheat to be unable to be extracted, or deformed, which seriously affects the final yield, except that the flufenic acid herbicide can be used in half after the jointing, other It is best not to try herbicides!

Organic and carbamate pesticides do not hit wheat herbicides 7 days before and after use

As we all know, the cornfield played organophosphorus or carbamate pesticides for an interval of 7 days to the use of herbicides, pesticides and wheat field played needs at least such an interval 3-5 days, to use the herbicide, Otherwise, it is easy to cause yellowing of wheat leaves, because organophosphorus pesticides reduce the ability of wheat to degrade herbicides, and the use of herbicides can easily lead to phytotoxicity.

Daily average temperature below 8 degrees without wheat herbicide

Except for individual herbicides (diflufenacil, which is less resistant to low temperature), the general herbicides are not ideal in low temperature weather. It is best to use the drug at a daily average temperature of 8 degrees or higher. The higher the temperature, the better the weeding effect. The grass absorbs light and grows vigorously, the pores are open, and it is easy to absorb water and liquid medicine (lower temperature is opposite), which can achieve good herbicidal effect.

Wheat herbicide in dry weather

In addition to looking at the temperature, the herbicide should also grasp the humidity of the soil. In the case of severe drought, it is necessary to grasp the timing of watering the wheat field and timely apply the medicine to ensure the efficacy of the herbicide. Most herbicides exert their effects. It requires a certain amount of soil moisture, and the soil moisture is most beneficial to the efficacy of herbicides when it is 40%-60%.

Do not use wheat herbicides before and after heavy rain and before the arrival of cold air

The use of herbicides before and after heavy rain and before the arrival of cold air affects the weeding effect on the one hand, and it is easy to cause phytotoxicity on the other hand. These are all bad weather, especially in the 7 days before the cold spring, the herbicides cannot be used, and the winter medication should pay more attention. Weather forecast.

Do not re-spray or leak spray wheat herbicide

The herbicide must be evenly sprayed. If the weeds are not evenly distributed in the place where the spray is sprayed or sprayed less, the control effect is definitely not good. Remember not to re-spray, the wheat is prone to yellowing, and it is easy to cause herbicide damage.

Wheat herbicide formulation must be diluted by double dilution

Before applying the drug, dilute the drug into a mother liquid with a small amount of water. When the medicine is used, first add the prepared mother liquid in the medicine barrel, then make up the remaining amount of water needed to mix and spray. In the market where Xiaobian visited, many dealers have realized the importance of the second dilution method. When selling drugs, they can prompt farmers to use drugs in this way. Most of the herbicides in the wheat field are mainly powders, sometimes mixed with various liquids according to the weeds in the ground. The second dilution method is undoubtedly the best way to evenly mix the liquid, and avoids the uneven mixing of the liquid. The uniform liquid solution also makes the herbicidal effect better.

Here, Xiao Bian warmly reminds everyone that due to some reasons such as long time period, variable temperature, and strong selectivity of herbicides, it is easy to cause phytotoxicity. Therefore, the above wheat herbicides Use taboos, I hope everyone can remember!

More pesticide knowledge, please pay attention to China Pesticide Network

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