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Chlorfluoxetine is a systemic post-emergence herbicide that is widely used in wheat, corn, and paddy fields to control broadleaf weeds. After the weeds absorb the liquid, the symptoms of the typical hormonal herbicides appear: the plants are deformed, twisted, and eventually die.
However, chloroflupiric acid is easy to produce phytotoxicity when used improperly. In July 2016, the author received a phone call to report herbicide after rice seedlings, and there was a phytotoxicity. In March this year, the author received a call and flupiroxyacetic acid appeared in the wheat field. Drug damage. After on-the-spot inspection, there are indeed phytotoxics, but the causes of phytotoxicity are not the same. Below we will slowly analyze the use technology and precautions of chlorofluoxyacetic acid in wheat, rice and corn fields.
1. The use technology and precautions of flupirtine in wheat fields
Fluroxypyroxyacetic acid is used in wheat fields to control most broad-leaved weeds, such as common weeds: swine fever, leeks, field flowers, gray green crickets, etc. When used, most of the herbicides are mixed, the herbicidal spectrum is enlarged, and the herbicidal effect is enhanced, and it is often mixed with herbicides such as diflufenacil, sodium dimethyltetrachloride, and bensulfuron. Chlorfluoxetine is safe to use in the treatment of wheat from three leaves to one day before jointing. According to practical experience, many areas, after the jointing of wheat, can also be used to avoid the flowering period, in order to prevent the gray-green carp (grey ash) that was later unearthed.
Let's analyze the symptoms and causes of phytotoxicity caused by chlorofluoxyacetic acid in a wheat field in the field in March this year.
From Fig. 1 and Fig. 2, it can be seen that the wheat leaves are mottled and yellow, especially the old leaves are yellow and withered, the new leaves are lighter than the old leaves; the wheat roots are white, the vitality is strong, and the roots have no problem. However, wheat growth was inhibited and it was significantly shorter than wheat that did not have phytotoxicity next door.
After communication, the author found that when farmers used flufenacetate, in order to prevent and control wheat sheath blight at the same time, mixed with difenoconazole, it was not thought that there was a phytotoxicity. When flupiroxyacetic acid is used in wheat fields, the author does not recommend mixing with triazole fungicides , such as commonly used: difenoconazole, propiconazole and the like. Triazole fungicides, in the case of special weather, will inhibit the growth of wheat by itself. Mixing fluoxetine can only aggravate the phytotoxicity. Triazole bactericides and herbicides are best used separately. After the occurrence of phytotoxicity, farmers in the timely spraying of canola, foliar fertilizer , field watering, topdressing and other measures, wheat recovery is not bad.
Let's take a look at the situation in Figure 3. When I went to the field to view it, it was already a week or so of drug damage. After the farmers had caused the phytotoxicity, they also took remedial measures in time. The symptoms of wheat phytotoxicity in the field were not serious. According to the farmers' reaction, 6.9% of oxazolidine emulsifiable concentrate was used in the case of clofibrate, in order to prevent grass weeds such as wild oats in the field. After taking the medicine, it will cause phytotoxicity. The symptoms of the phytotoxicity just started are similar to those in Figure 1 and Figure 2.
In the normal field of medicine, flupiroxyacetic acid and fenoxapropin were mixed. There was no major problem. Why did the phytotoxicity occur this time? After careful observation, it was found that this field of wheat was planted very late, and It belongs to the typical “rice-wheat†farming mode.
About 10 days before the harvest of late rice, wheat seeds were planted in the field. The seeds were distributed on the soil surface, the roots were shallow, the frost resistance was poor, and the drug resistance was relatively poor. In addition, due to the late planting, the wheat seedlings are smaller, and in special cases, the damage will be aggravated.
Second, the use of chlorofluoxyacetic acid in rice fields and matters needing attention
In recent years, with the increase of the area of ​​direct seeding rice, there are more and more weeds in the field, especially broad-leaved weeds, such as water bamboo leaves, cloves, water peanuts, mozzarella, and water celery. 20% flufenoxyacetic acid emulsifiable concentrate is used for weeding after 4 leaves of rice to pre-jointing, generally 20-30ml a bucket of water, two barrels of water per mu, the effect is good.
In late July 2016, the author was exposed to the phenomenon of chlorofluoxyacetic acid producing phytotoxicity after rice seedlings. The rice leaves were yellow and severely wilted. After a field visit, I learned that when the farmers used the medicine, they mixed with other weeds that were used to control the grass. The temperature was close to 40 °C. More seriously, in order to improve the herbicidal effect of the herbicide, there is a phenomenon in which a penetrating agent such as silicone is mixed. It is easy to produce phytotoxicity when it is used under high temperature conditions and a penetrant such as silicone is added. The author suggests: when using clofibrate to remove grass after rice seedlings, avoid high temperature medication at noon, especially when the temperature is around 35 °C, do not use drugs; do not mix penetrants such as silicone, penetrant to improve the herbicidal effect, It also increases the probability of phytotoxicity.
Third, the use of chlorofluoxyacetic acid in corn fields and matters needing attention
When weeding the corn seedlings, the commonly used herbicides are: nicosulfuron, mesotrione, oxafluridone, atrazine and the like. These herbicides are not very good for the control of malignant broad-leaved weeds in the field, such as: purslane, snails, and radish. They are generally mixed with 20% flufenoxyacetic acid to increase the spectrum of killing grass.
Chlorfluoxetine is weeded at the 3--5 leaf stage of corn seedlings. Avoid the high temperature before and after noon, and try to avoid the rhizome of corn. When used at high temperature, especially summer corn, due to the relatively high temperature and temperature at noon, it is easy to produce phytotoxicity. The main symptoms are: corn root growth is inhibited, corn is easy to fall, and roots become brittle (Figure 4 corn lodging). This phytotoxicity occurs, don't help the corn, let it grow naturally.
Finally, how to solve the phytotoxicity of clofibrate?
Fluroxypyroxyacetic acid weeds in wheat, rice and corn seedlings. If phytotoxicity occurs, foliar sprays of plant growth regulators (brassinolide, gibberellic acid, etc.) and foliar fertilizers, general phytotoxicity It will be greatly improved and will have no significant impact on crop yields. In short, when using flufenoxyacetic acid to control broadleaf weeds, it is necessary to adapt to local conditions, master the use of medicine technology, and reduce the probability of occurrence of phytotoxicity.
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