Top ten problems with herbicides in wheat fields at the beginning of 2018?

1.
Insufficient stocking before the year and severe shortage after the new year is a very common problem.
This year is especially serious.
Starting from the seventh day of the new year, the weather in the north has cleared up, the temperature has risen, and the herbicides in wheat fields have entered a small peak.
, The number of calls from dealers to urge goods has increased sharply, and manufacturers have insufficient supply
.
a.
Before the temperature was low and the amount of herbicides was low, dealers were afraid to stock up in large quantities; b.
The manufacturers could not accurately predict the market volume of herbicides after the year.
In addition, the manufacturers were afraid to produce goods in large quantities when the herbicides were used in the late stage; c.
Years ago, the supply of herbicide raw materials was tight, especially for commonly used herbicides.
Manufacturers did not have enough raw drugs, and the preparations were naturally short; d.
Wheat field herbicides were relatively selective and there were many varieties, and manufacturers could not accurately predict the types of weeds in the field after the year.
Due to the occurrence area, individual varieties cannot be stocked in large quantities
.
e.
The use time of herbicides is concentrated, which affects logistics during holidays
.
Even though your phone call explodes, you still have money and no goods.
In the face of this situation, dealers have to stock up on the basis of previous sales.
According to this year’s weather conditions, observation of the occurrence of mainstream weeds in the field and their own sales area, they should stock up reasonably.
Don't have a serious out-of-stock phenomenon.
In the end, a small amount of inventory is not a problem, and seize market opportunities
.
2.
Pay attention to the mixture of herbicides, insecticides, fungicides, and foliar fertilizers when using medicine after the year
.
Years later, wheat is prone to some diseases and insect pests such as red spiders and sheath blight.
Many farmers like to mix some fungicides, insecticides, and foliar fertilizers when applying herbicides in order to save trouble.
It is not recommended to mix them here, especially triazoles.
It is easy to cause phytotoxicity when mixed with herbicides, and organophosphorus pesticides cannot be mixed; secondly, some special herbicides, such as mesosulfuron, isoproturon, fluazuron, carfentrazone and other herbicides themselves There are requirements for the application technology, generally not allowed to be mixed, which is prone to phytotoxicity; the final control target is inconsistent, and it is not recommended to mix.
, The mixing can not achieve the desired effect
.
3.
New types of broad-leaved weeds, such as Popona and Niu Chinweed, occur in a large area and will be difficult to control after a year
.
The common weeds in the wheat fields, the common weeds in the wheat fields, the common weeds in the wheat fields, the common weeds in the field, the weeds in most regions, but the weed communities have changed in various places in the past two years.
For example, mother-in-law and cow chickweed are common in wheat fields and are not easy to control
.
The formula commonly used in the market is tribenuron-methyl + diflufenazone + carfentrazone, tribenuron-methyl + fluroxypyr + carfentrazone, etc.
It is applied in the young weed period when the temperature is relatively high.
The medicine can achieve very good control effect
.
However, there is basically no control effect when the medicine is used in the period of large branches and flowering, so the difficulty of prevention and control will increase after the year
.
4.
Ryegrass multiflorum increases sharply, and resistance is difficult to control! Lolium multiflorum first occurred in southern Henan.
In the past two years, ryegrass multiflorum has been increasing year by year in many major wheat producing areas, which has a great impact on wheat production.
According to dealers, ryegrass multiflorum has developed resistance characteristics.
Difficult to prevent and control, fluoxsulam, fluazuron-methyl, pinoxaden, and disulfuron-methyl all have certain control effects before the development of resistance, but even if the above two components are combined, they can not be controlled after the resistance is developed.
, And even farmers said: If they can control ryegrass, even if they use 100 yuan per mu, they are willing to use the medicine.
This shows the difficulty of weed control and the anxiety of farmers
.
The occurrence area of ​​ryegrass must be increasing everywhere, so a new test is put forward for manufacturers to develop and test effective control products as soon as possible
.
Distributors should pay attention to the production of resistant weeds during the promotion process, and don't wantonly exaggerate the effect of the product
.
5.
Jiejiemai increased sharply, and the dosage of metsulfuron increased.
Pay attention to the problem of phytotoxicity after the year
.
It is well known that the occurrence area of ​​Gramineae weeds in wheat fields is increasing day by day.
At present, the herbicide that is better for preventing and controlling the wheat fields is mesosulfuron, but the biggest disadvantage of mesosulfuron is the phytotoxicity , Especially in the case of large dosage, low temperature, and cold weather seven days before and after the medication, it is prone to phytotoxicity.
In severe cases, the pellets will not be harvested.
Although each area has a long history of use, you can master the method of use, but you still need to remind Everyone: When recommending that farmers use medicine, they should observe the weather on the one hand, and on the other hand, do not allow farmers to increase the amount of medicine at will
.
6.
The area of ​​gramineous weeds has increased, and the cost of farmers' prevention and control has increased
.
Jiejie wheat and wild oats are common gramineous weeds in wheat fields.
They have become mainstream weeds in the past two years.
When farmers apply pesticides, they no longer control broad-leaved weeds.
The cost of grass is very high, so farmers’ cost per mu in terms of weed control increases, generally 15-20 yuan/mu.
At the same time, higher requirements are placed on the dealer’s plant protection technology.
The dealer must be based on the farmer’s field when selling herbicides.
The types and sizes of weeds are reasonable.
Do not let farmers use ineffective herbicides, which increases costs and is not conducive to building your own brand
.
7.
Use medicine after the year to grasp the best period for weed control
.
Weeds in wheat fields have a small peak period from February to February each year.
For most areas, the effect of drug use after this year is better than before.
Last year, wheat was planted late due to the weather, and the number of weeds was very small before the year.
After the year the temperature rises, weeds will have a peak of weed emergence.
From the current point of view, wheat has not been closed in many areas this year (the wheat has been closed in previous years), and it is not difficult to weed in the field, and the control effect is relatively good.

.
8.
Last year, wheat was planted late, and the current situation is weak.
In the next year, pay attention to the problem of herbicide phytotoxicity
.
In many areas last year, wheat was not sown until late October (previous years were sown in early October).
It was nearly a month late, and the overall growth of wheat was slow, and the seedlings were weak and drug-resistant, especially when using some pesticides such as carfentrazone.
After the occurrence of phytotoxicity, the peak period of drug use will be the peak period after the year, and the growth of wheat will be relatively weak after this year.
When selling herbicides, pay attention to the recommended dosage and use of certain products
.
9.
Pay attention to the period of herbicide use.
Do not use the herbicide during the jointing period.
After the year is a peak period for herbicide use, the application time is very short, because the temperature rises generally higher after the year, and the wheat is in the jointing period soon.
Spray again at this time.
The application of herbicides will have an impact on the jointing bootings of wheat.
Most herbicides are not recommended.
This year’s wheat planting late jointing period will be relatively delayed, and the usable period of herbicides will increase.
Everyone should seize this good weed control opportunity.
Do not use medicine once jointing
.
10.
Pay attention to the problem of the compounding of grass and broadleaf weeds.
At present, the phenomenon of simultaneous occurrence of grass and broad weeds in wheat fields is quite serious.
The grass and broadleaf products are widely used, but not all herbicides for controlling broad-leaved weeds can control grasses.
Mixed use of weed herbicides, such as carfentrazone and 6.
9% oxfenoxaprop-ethyl and other preparations and silicone additives, will produce antagonistic effects, which may affect the uniform distribution of carfentrazone in water, so compounding is not recommended
.
Carfentrazone and low-content clodinafop can be compounded, but pay attention to not too much carfentrazone
.