The Effect and Application Techniques of (Maijing) in Controlling Weeds in 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.

In 2011, Jiangsu Kuaida Agrochemical Co., Ltd. developed a 50% imidacloprid wettable powder, which was validated in winter wheat fields from 2012 to 2014 by agricultural research departments in Hubei, Jiangsu, Shandong, and Tianjin provinces. The safety, period of use, dosage, and method of use of this formula have been clarified.

1、 Product Introduction

1. Common name: Pyrfluoroacetamide

2. Content: 50%

3. Dosage form: wettable powder

4. Applicable scope: wheat, barley, corn, soybean

5. Prevention and control targets: broad-leaved weeds such as pig weed, Artemisia annua, Zeqi, Shepherd's purse, Water bitter endive, Fanzha, Great Nest vegetable, Chenopodium album, etc.

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 50% difluorochlor wettable powder has high safety for winter wheat.

2. Wide spectrum of weed killing: It can effectively prevent and control annual and interannual broad-leaved weeds such as winter wheat field pig plague, sowing mother Artemisia annua, Chinese wolfsbane, shepherd's purse, spring grass, water bitter thistle, gray cabbage, etc. Better than the control agent 10% benzsulfuron methyl 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. Excellent control effect: According to the results of experiments conducted in winter wheat fields in Hubei, Jiangsu, Rice, and Tianjin provinces from 2012 to 2014, the total grass control effect of the four treatments of 25g/mu, 30g/mu, 35g/mu, and 60g/mu was 81.2-95.16%, 85.2-97.5%, 90.7-98.8%, and 94.0-99.67%, respectively, 30 days after treatment, which was 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 30-35 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. 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. 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.

3. 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.

4. This product has average control effects on grasses and sedges, and can be mixed with herbicides in the grass family (such as chlorotoluron and isoproturon) to expand the herbicide spectrum.

5. Sensitive to crops such as Brassica napus, cucumber, rice seedlings, tomatoes, etc. When spraying, it is prohibited to allow the liquid to drift onto this crop.

6. 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.