Many people have recently reported that there are quite a lot of grasses in the recent past, but don't mistake them for herbicides now.
Due to the weather, herbicides should be used with caution recently.
When the cold air in the north is at the end of autumn and winter, if the minimum temperature of the weather forecast is lower than 5 °C, the minimum temperature near the ground may be lower than 0 °C, frost will appear; the lowest temperature will reach 1 to 2 °C, and heavy frost may occur.
Do not use herbicides such as isoproturon or piracetamide before the occurrence of strong cooling frost. Otherwise, phytotoxicity may occur. (especially wheat that has not been subjected to low temperature exercise, should avoid applying before the initial frost.)
Many people have recently reported that there are quite a lot of grasses in the recent past, but don't mistake them for herbicides now.
Due to the weather, herbicides should be used with caution recently.
When the cold air in the north is at the end of autumn and winter, if the minimum temperature of the weather forecast is lower than 5 °C, the minimum temperature near the ground may be lower than 0 °C, frost will appear; the lowest temperature will reach 1 to 2 °C, and heavy frost may occur.
Do not use herbicides such as isoproturon or piracetamide before the occurrence of strong cooling frost. Otherwise, phytotoxicity may occur. (especially wheat that has not been subjected to low temperature exercise, should avoid applying before the initial frost.)
Let’s first look at the weather
National Wind Cooling Forecast Chart (08:00, 2017, 08:00, 08:00, 2017)
Minimum temperature forecast chart for the process from 08:00 to 19:00 on November 17, 2017
From 08:00 to 18:00 on the 17th, there are small to medium snow or sleet in the eastern part of the Northeast, and heavy snow in the local area; parts of the southwestern part of the country, Jianghan, southern Huanghuai, Jianghuai, Jiangnan, and central and western China. There are small to moderate rains in the region. There are heavy rains in parts of central Jiangxi, southern Zhejiang, northern Fujian, and northeastern Guangxi. There are 4 to 6 winds in the central and eastern Inner Mongolia, North China, Huanghuai, Jianghuai, and Jianghan.
From 08:00 to 18:00 on the 18th, there were snow or sleet in central and southern Gansu, western and southern Tibet, eastern Jilin, and northern Shandong Peninsula; southeastern part of the northwest, eastern part of southwest, south and south of the south, There are small to moderate rains or showers in southern China, central and eastern Yunnan, and Hainan Island. There are heavy rains in the local area; there are 4 to 6 winds in most of the central and eastern regions.
Wheat herbicide suspended
After the application of isoproturon,
In the short term, it is prone to phytotoxicity when it encounters low temperature frost weather.
After administration of flufenacetamide,
In the short term, the temperature is low and the soil moisture is high, which is also prone to phytotoxicity.
It can be considered to apply the medicine one or two days after the strong temperature drop and low temperature weather. When the weather is stable, try to ensure that there is no serious frosty weather within 1 week after application (no cold air south, the daily minimum temperature is not lower than 0 °C) .
Huanghuai Mai District, Shandong Liaocheng
In late October, low temperature weather below 10 °C has appeared. In many places, early frost has appeared. In some fields, the wheat seedlings are seriously damaged by the initial frost and the leaves die. At present, the local field wheat seedlings have generally been subjected to low temperature exercise.
There was a strong cooling in the past two days, and then the weather was fairly stable. Although there was a strong cooling weather, the cooling rate was not very large (or there was light rain, and the lowest temperature was 0 to -1 °C in the near future).
The weather forecast will show a minimum temperature of -1 °C on November 17th. There is a great risk of phytotoxicity in these days. It is best not to use it. In particular, soil-dried fields or fields in the tuyere, low-lying fields that are susceptible to frost, it is best to apply the medicine after the low temperature on November 18, and the weather is relatively stable for a long time.
Su Shi and other places
According to the weather forecast information, there will be strong cooling frost weather in Susong and other places on the 17th of this month. The Xuzhou and other places in Huaibei will have a low temperature of -5 °C on the 18th. Do not apply herbicides in the wheat fields in the past two days.
In particular, the early buckwheat in Huaibei and the wheat fields that have emerged in the past, do not apply systemic herbicides in the past few days before the cooling.
In addition to isoproterone, methyl disulfuron, two more dangerous drugs, clodinafop, oxazolin, benzoxazole, benzosulfuron, bensulfuron, flufensulfuron, Do not use acesulfame, flupiroxime or flufenacetate.
After the strong temperature drop, the weather will stabilize, and the herbicide can be used according to local conditions.
Prevention and remedies for herbicide phytotoxicity:
Benzosulfuron + bensulfuron-methyl
Causes: Due to the serious resistance of the main weed population in the wheat field, the ferocious weeds such as swine fever and the rapid increase of the malignant weeds such as swine fever, and the blind recommendation of the distributors, the dosage of this kind of medicament has no limit. In addition, many farmers see the grass and apply the medicine. The grass is repeatedly sprayed repeatedly, and the spraying is uneven. In case of rain or low temperature and high humidity, the wheat will be phytotoxic.
Symptoms of phytotoxicity: wheat leaves are chlorotic, yellowing to varying degrees, plant growth is inhibited, and wheat seedlings appear uneven. The roots of wheat are damaged, the number of secondary roots is reduced or black mold is bad, and the heavy ones die. The farmers describe it as “flower baldnessâ€.
Prevention method: Control the dosage. The effective component of the amount of benzenesulfuron can not exceed 2 grams, bensulfuron-methyl can not exceed 1.5 grams, the two agents should be appropriate to reduce the amount of compounding.
Remedy: When the phytotoxicity occurs, according to the degree of severity, timely spray sputum lactone lactone + potassium dihydrogen phosphate 2~3 times, combined with the use of quick-acting fertilizer, the dry field should be watered, the field with high humidity should be drawn锄 loose soil, increase soil ventilation, promote wheat roots and restore normal growth.
Bensulfuron-methyl chlorofluoropyroxyacetate
Cause: Basic with benzosulfuron + bensulfuron-methyl. Because of its good systemic activity and high activity, flupirtine has a good herbicidal effect in the field, and the field use continues to increase, which in turn increases the frequency of phytotoxicity.
Symptoms of phytotoxicity: The leaves of wheat are chlorotic and yellow, and some of the leaves are not rolled or twisted. Other symptoms are the same as that of trisulfuron + bensulfuron-methyl, but they are biased.
Prevention method: control the dosage, the benzene sulfonamide is controlled with the active ingredient below 2 grams, and the flupiroxib acid is below 8 grams. If the two agents are compounded, it must not exceed 2/3 of the single dose.
Remedy: Benzsulfuron + Bensulfuron.
In fact, there are many kinds of phytotoxicity in wheat, so I will not introduce them one by one...
Wheat remedies:
Irrigation and detoxification
Detoxification measures should be taken as early as possible. When the phytotoxicity has occurred or is about to occur, immediately carry out irrigation and detoxification measures, drain the toxic irrigation water in the field, continuously flush with fresh water, or combine the drainage with lime to neutralize the acidic herbicide in the field. Reduce phytotoxicity.
For the phytotoxicity on the plant, the residual agent on the poisonous plant can be rinsed by spraying or spraying water to reduce the phytotoxicity.
2. Add fertilizer
Field management should be strengthened for the affected wheat fields. 2,4-D herbicides applied improperly to wheat seedlings. When tubular leaves were found, it was necessary to increase the application of tillering fertilizer, promote tillering, and increase the rate of ear formation to reduce the damage of phytotoxicity. In fertilization, attention should be paid to the application of organic fertilizer. The organic matter acts as an adsorbent on the herbicide, causing the herbicide to lose some of its activity.
3. Use antidote
The use of plant growth regulators to promote wheat growth, plant growth regulators can promote the growth of wheat, stimulate the growth and development of wheat, but also help to reduce phytotoxicity. Commonly used detoxification drugs such as gibberellin, spraying 2 grams of water per acre with 50 kg of water to evenly spray the wheat seedlings can stimulate the growth of wheat seedlings and reduce the phytotoxicity.
4. Timely investigation and replanting
For the land that is seriously damaged by the phytotoxicity, causing dead wheat or unable to joint and heading, it is necessary to timely replant or replant other crops to minimize the damage of phytotoxicity.
Expansion: 9 major precautions for wheat herbicides!
It is safest to apply herbicides 40 days after the winter wheat is planted after mulching the first water (first water). At this time, the wheat is worth 4 leaves or 4 leaves, and it is more tolerant to herbicides. The agent is the safest.
In addition, when the wheat 4 leaves stage, most of the weeds have been released, and the grass age is relatively small, the wheat has no tillers, and there are not many leaves, it is easier to kill the weeds. At this time, the herbicide is most effective.
1. Strictly control the temperature.
Herbicides are generally labeled at 2 ° C or can be used at 5 ° C. So what is the temperature at 2 ° C and 5 ° C, which is the temperature at the time of use or the lowest temperature?
The answer is the latter. The temperature mentioned here refers to the lowest temperature, that is, the lowest temperature can be used above 2 ° C, and the temperature should not be lower than the temperature before and after the herbicide.
2. It is forbidden to use medicine on windy days.
It is easy to cause the herbicide to float when it is used in windy days. If the effect is not good, it may blow up to the greenhouse crops or other crops to cause herbicide damage. Therefore, it is necessary to pay attention to the prohibition of medication on windy days.
Do not use drugs in bad weather. It is forbidden to use herbicides in bad weather such as frost, rain, snow, hail, cold current, etc. It is also necessary to pay attention to the bad weather before and after herbicides. Farmers must pay attention to the weather forecast.
3. It is forbidden to use drugs in bad weather.
It is forbidden to use herbicides in bad weather such as frost, rain, snow, hail, cold current, etc. It is also necessary to pay attention to the bad weather before and after herbicides. Farmers must pay attention to the weather forecast.
4. Do not use herbicides when the wheat seedlings are weak and the roots are bare.
Generally, winter wheat fields will be returned to the field, and the land will be loose. If there is an abnormal weather, such as a warm winter drought year, it must be noted that the root system of wheat may be too loose due to the soil being too loose, or some roots may be bare, so that Wheat is easy to cause frostbite and water shortage. Such wheat seedlings are the most sensitive and fragile. If herbicides are used at this time, it will cause some damage to wheat.
5. Do not use herbicides when the wheat is sick.
Generally, winter wheat fields will be returned to the field, and the land will be loose. If there is an abnormal weather, such as a warm winter drought year, it must be noted that the root system of wheat may be too loose due to the soil being too loose, or some roots may be bare, so that Wheat is easy to cause frostbite and water shortage. Such wheat seedlings are the most sensitive and fragile. If herbicides are used at this time, it will cause some damage to wheat.
Do not use herbicides when wheat is sick. In recent years, wheat sheath blight, root rot, total eclipse and other species or soil-borne diseases frequently occur. Farmers' friends use herbicides to determine if their own wheat seedlings are sick. If it is sick wheat, it is best not to use weeding. Agent. It is recommended that farmers' friends must pay attention to the use of special pesticides before planting wheat to prevent the occurrence of diseases.
6, the use of herbicides must pay attention to the second dilution.
Some farmers' friends can save the herbicide directly into the sprayer, just find a branch and stir it. This method of redemption is very unscientific. Because most herbicide products carry their own auxiliaries, the auxiliaries act as osmotic synergists. They are usually viscous. If they are poured directly into the sprayer, they may sink to the bottom of the bucket. If not fully stirred, it may cause help. The agent can not be opened by the herbicide, which may lead to two consequences:
One is that the medicines are all finished, and some of the herbicides are not opened at the bottom of the barrel, causing waste;
Another consequence is that the herbicides in the wheat field that were just started are very light, and the herbicides that are finally hit are very heavy. Therefore, the use of herbicides must pay attention to the second dilution.
The correct quality preparation method is the second dilution method: first add a small amount of water to the mother liquor, then pour into a sprayer containing a certain amount of water, then add the amount of water to be added, and stir while mixing, and mix thoroughly to the required concentration. .
Do not pour the medicine into the potion first, so that the medicine is easily deposited in the suction pipe of the sprayer, so that the concentration of the first sprayed liquid is high, and it is easy to cause phytotoxicity. The concentration of the liquid sprayed later is low, and the herbicidal effect is poor.
Also, do not pour the medicine into a sprayer containing a large amount of water, so that the wettable powder tends to float on the water meter or form a small piece, and the distribution is uneven, which not only does not guarantee the effect but also easily blocks the spray hole when sprayed. In addition, the liquid should be prepared with clean water.
7. Herbicides must be used strictly in accordance with regulations to avoid excessive use.
Some farmers’ friends will spray a few times in grassy places when they are fighting herbicides, or they will be afraid to waste the last remaining herbicides on the last plot. This is a very easy way to cause herbicide damage. Because the herbicide is safe for wheat at normal use concentrations, if it is used excessively, the wheat itself cannot be broken down, causing damage to the wheat.
8. Correctly treat the phenomenon of yellowing seedlings of herbicides.
After some herbicides are used, wheat will have a short yellow tip, which is a normal seedling phenomenon. It usually recovers when the wheat is green. This phenomenon will not cause the production to decrease, but will increase the yield of wheat. It can prevent wheat from affecting its reproductive growth due to excessive nutrient growth, so farmers do not have to worry about this phenomenon.
9. Strictly control the temperature.
Finally, I would like to remind you that the wheat weeding should pay attention to the weather temperature and humidity. When using the medicine, the average temperature should be higher than 6 degrees, and it is best from 10:00 am to 3:00 pm. If the soil is relatively dry, pay attention to increase the water. The amount, if there is water, will affect the efficacy of wheat herbicides.
Therefore, when applying wheat herbicides, it is necessary to seize the opportunity, consider in many ways, and timely use the medicine to lay the foundation for high yield of wheat. After the wheat is planted and emerged, a series of management will begin. The weeds in the wheat fields must be removed early. Therefore, this knowledge will be used immediately. It is beneficial to collect them in advance.
More pesticide knowledge , please pay attention to China Pesticide Network
Anti Corrosion Pvc Roof Tile,Long Span Plastic Pvc Roof Tile,Tile Type Plastic Roof Sheet,Waterproof Roofing Sheet
ZHENHAO BUILDING MATERIALS CO.,LTD , https://www.nbpvcroof.com