The Effect and Application Techniques of Qianjinmai in Controlling Weeds in Winter Wheat Fields



Pyrfluconazole belongs to the class of substituted pyridylanilide herbicides, mainly used to control various annual grass weeds and certain broad-leaved weeds in corn, soybean, and wheat fields. This variety is a selective contact and residual herbicide, and its action is to inhibit the biosynthesis of carotenoids by inhibiting the eight hydrolycopene dehydrogenase. When weeds germinate, both the young shoots or roots of the soil layer can absorb the pesticide, and the carotenoid content in the weed plants that absorb the pesticide decreases, leading to the destruction of chlorophyll, cell membrane rupture, and faster action. After use, the weeds exhibit albinism, and finally the entire plant wilts and dies. The speed of death is related to the intensity of light, with fast light intensity and slow light intensity. Generally speaking, the application amount is 125-250 g/hm2, which is used for autumn sowing of wheat and barley fields before or early after sprouting to prevent and control weeds in the gramineae family and broad-leaved weeds, especially weeds in the pig weed, motherplant, and viola genus.

Isopropanone is a selective herbicide that replaces urea and has effects on soil treatment and stem and leaf treatment. After being absorbed by the roots of the plant, the pesticide guides and accumulates in the leaves, inhibiting photosynthesis and leading to weed death. Isopropanol can control annual weeds in wheat, barley, and other crop fields, such as main grass weeds such as Matang, Chenopodium, Poa pratensis, Kanmai Niang, hard grass, and some broad-leaved weeds.

In order to explore the feasibility and scientificity of mixing the two, indoor bioassays were conducted at Hunan Academy of Agricultural Sciences in 2011 to determine the reasonable ratio of pyrfluconazole and isoproturon. We have developed a 60% imidacloprid • isoproturon wettable powder and conducted efficacy validation in winter wheat fields from 2012 to 2014 in four provinces including Hubei, Jiangsu, Shandong, and Tianjin. The safety, period of use, dosage, and method of use of this formula have been clarified.

1、 Product Introduction

1. Common name: Pyrfluconazole • Isopropanone

2. Content: 10% pyrrolidone, 50% isoproturon

3. Dosage form: wettable powder

4. Applicable scope: wheat, barley

5. Prevention and control targets: main gramineae weeds such as Matang, Poa pratensis, Kanmai Niang, Hard Grass, and Grass Grass, as well as broad-leaved weeds such as Sophora, Artemisia argyrophylla, Zeqi, Shepherd's purse, Water bitter endix, Fanzha, Dachao Cai, Chenopodium.

2、 Product features:

1. Good safety: After repeated trials of 8 winter wheat varieties in Hubei, Jiangsu, Rice, Tianjin and other four regions from 2012 to 2014, they were used during the tillering stage (2-5 leaf stage) of the wheat growth period. The wheat grew normally, showed no signs of pesticide damage, increased yield significantly, and showed no difference in sensitivity between varieties. This indicates that the 60% difluorocycloxamide • isoproturon wettable powder has high safety for winter wheat.

2. Broad spectrum of weed control: It can effectively prevent and control annual and interannual broad-leaved weeds such as winter wheat field pig weed, sown Artemisia annua, fangweed, shepherd's purse, spring grass, water bitter thistle, gray cabbage, as well as annual grass weeds such as hard grass, kentucky bluegrass, kentucky bluegrass, Japanese kentucky bluegrass, and bromegrass. It is superior to two single doses of the control agent, 50% fluconazole wettable powder and 50% isoproturon wettable powder. At a dose of 120-300 grams/667 square meters, the control effect on annual weeds is significant, and the control effect increases with the increase of dose.

3. Significant additive effect: According to the results of different concentrations tested at the Plant Protection Research Institute of Hunan Academy of Agricultural Sciences after 15 days of medication, the equivalent maps of 90% inhibition on the fertility of Kanmai Niang and Suimi Shepherd's purse were obtained for the combination of Pirfluconazole and Isopropanone. In the figure, when the mixed pair of Pirfluconazole and Isopropanone had a 90% inhibition rate on the fertility of Kanmai Niang and Suimi Shepherd's purse, both showed additive effect.

4. Excellent control effect: According to the results of experiments conducted in winter wheat fields in Hubei, Jiangsu, Rice, and Tianjin from 2012 to 2014, the total grass control effect of the four treatments of 120 g/mu, 150 g/mu, 180 g/mu, and 300 g/mu after 30 days of application in the 2-3 leaf stage of wheat was 78.2-93.4%, 85.3-96.5%, 87.7-98.69%, and 93.7-99.48%, respectively, which were significantly higher than the control single agent.

5. Wide usage period: It can be used from the 2-3 leaf stage to the 4-5 leaf stage of wheat, before the end of tillering, and before winter, after winter, and before spring. It can be sealed before sowing or treated with stems and leaves after sowing.

3、 Using technology:

1. Usage period: after wheat sowing, pre seedling sealing treatment, post seedling 2.5 leaves to pre tillering stage stem and leaf treatment

2. Dosage: The dosage per mu is 150-180 grams. Weeds with older leaves need to increase their dosage accordingly.

3. Water volume: 30-45 kg/mu

4. Application method: add water evenly and spray.

4、 Precautions:

1. This product has the function of soil sealing treatment for non germinating weeds. When spray, sufficient water should be used to keep the soil moist. However, continuous heavy rain, especially during the bud stage, can cause temporary discoloration of crop leaves during pre bud application, but it can quickly recover without affecting yield. Before using this medicine sprout, it is necessary to finely level the land, cover the seeds tightly after sowing, and then apply the medicine. After applying the medicine, the surface soil layer should not be disturbed.

2. For stem and leaf treatment, the application amount should be determined based on the leaf age of the weed, and the corresponding application amount should be used for weeds with different leaf ages.

3. Soil moisture has a significant impact on weed control effectiveness. After application, the soil is moist and the temperature is relatively high, resulting in fast efficacy and good weed control effect. Isopropanol can reduce the cold resistance of wheat seedlings. In the short term, if the wheat field encounters low temperature frost after application, the wheat seedlings are prone to frost damage and should be temporarily suspended from use. Do not use if the daily average temperature is below 4-5 ℃, wheat is sown too late, and cold air occurs frequently. If the temperature drops suddenly, do not use it to prevent frost damage. Apply the medicine after the temperature rises or stabilizes.

4. Weak seedlings, when the temperature in the field is below 5 ℃, need to practice seedlings. After the temperature rises or the seedlings are strong, medication should be used.

5. The component of pyrfluconazole is a residual herbicide, and the dosage of pyrfluconazole should be controlled for the next crop of rice. High dose (effective ingredient 30g/667m2), used for barley. The next crop of rice has whitening phenomenon, and the next crop of wheat in the field of small wheat has greater pesticide damage and less wheat damage. It is recommended to pay attention to the safety interval (interval of 80 days) and use it before winter. The dosage of active ingredients used before winter should be controlled below 30g/667m2, while the dosage of active ingredients used after winter should be controlled below 20g/667m2.

6. The manual spray should be used when applying in the wheat field (do not use the motorized spray, because the motorized spray will reduce the water consumption due to the use of herbicides, and will have a negative impact on the wheat seedlings due to the high concentration of drug dosage and solution). The uneven application of spray will cause slight harm. It is prohibited to drift the medicinal liquid onto broad-leaved crops such as rapeseed and broad beans.