Wheat winter weeding, why is prone to drug damage

Is it due to herbicides or improper application by farmers

According to traditional application habits, winter is the best time for weeding wheat fields for three reasons.

①Wheat in the field has not yet closed the monopoly, which is conducive to herbicide liquid contact with the ground, which is conducive to both killing weeds, and closed weed control.

②Weeds are in the young stage (3-5 leaf stage), which are weak against herbicides. At this stage, even if we take common formulation herbicides, such as benensulfuron + diflubenzuron + azoxystrobin formulation, we can achieve more ideal effect of killing and closed weed control.

③ Wheat in the 4-6 leaf stage has a strong detoxification ability to herbicides by itself, and under normal circumstances, it will not produce more serious drug damage.

However, up to now, in the yellow and huaihe winter wheat planting area, there are many farmers feedback, after spraying the wheat herbicide, the field wheat appeared more serious drug damage problem, this phenomenon in previous years is relatively rare.

After consulting with the local agricultural store owner, was told that the improper application of the drug caused, but this argument is obviously not convincing.

So, is there something wrong with the way you apply the herbicide, or is there a problem with the herbicide itself? Everyone urgently needs a statement.

Wheat winter weeding, encounter 4 kinds of situation should avoid application or delay application

It's not too late to know

① Wheat with vigorous growth phenomenon should be suspended or replaced herbicide

After a survey, we found that all the fields with more serious drug damage are dominated by wheat fields with vigorous growth.

This year, since the beginning of winter, the Yellow Huaihai Sea winter wheat planting area, the temperature fell slowly, the average daily temperature is significantly higher than in previous years, for sowing too early, sowing too much, too much nitrogen fertilizer application of wheat fields, basically appeared vigorous growth of seedlings, many wheat fields even at the end of November to seal the monopoly phenomenon.

Although the vigorous growth of the seedlings, but the plants are generally weak, the ability to resist herbicides reduced, especially the spraying of herbicides containing azoxystrobin, will often increase the risk of damage and the degree of damage, and some purity of azoxystrobin products, the severity of the damage is more serious.

Therefore, when it comes to wheat fields with vigorous seedlings, try not to use herbicides containing azoxystrobin to avoid more serious drug damage.

② temperature instability should be suspended application

Winter temperature is more repeated, farmers should seize the favorable time to timely application, the so-called timing, refers to the average temperature to reach 8 ℃ above, the minimum temperature should be higher than 3 ℃, and 3-5 days after application can not appear temperature plunge, or significant rainfall weather.

If the climatic conditions do not meet the above requirements, even if the field wheat and weeds are eligible for application, it is necessary to do opportunistic application, forced application will increase the risk of increased damage.

③ Wheat growth conditions should be delayed

For some late-sown wheat, the growth period is less than 40 days and the seedlings do not reach three leaves and one heart, even if the climate conditions are suitable, it is not recommended to spray herbicide.

Besides, it is not recommended to spray herbicides on fields with more yellow seedlings and weak seedlings.

④If you do not have the ability to apply herbicide, it is recommended not to apply it

Spraying wheat herbicide requires a high level of application. Today's wheat herbicides are mostly water-dispersible granules, suspensions and wettable powders, which are difficult to melt thoroughly without secondary dilution, resulting in varying concentrations of the liquid in the sprayer, which will lead to unsatisfactory results in some areas with too light a dose and damage in some areas with too dense a dose.

Especially when mixing broadleaf herbicides and grass herbicides, or when spraying herbicides for the control of knotty wheat (methyldisulfuron), the second dilution of this link, will be the key point to determine the occurrence of drug damage or not.

The second requirement is to apply the herbicide evenly, not only to do not miss spraying, but also to do not overspray, even if the weeds are more areas, not extra care, easy to overlap the application of the area, is also the most likely to produce the area of drug damage.

The last is to choose the right herbicide, today's wheat field herbicide, to the combination of the majority, spraying once, basically can solve all broad-leaved weeds in wheat fields, which is the advantage of the combination of the package.

The disadvantage is that it is easy to form pesticide waste, in addition to increasing the cost of application, causing weeds to form serious resistance, too large a dose of herbicide, but also easy to increase the risk of damage.