Factory Price Herbicide Diflufenican 500WDG 300SC

Application Techniques of Pyrifluquinazon in Wheat

1. Timing of Application: For optimal weed control, it is best to apply pyrifluquinazon early either before or after wheat emergence. Typically, applying in the fall before wheat emergence will provide effective control until the spring germination period of weeds. However, if there is heavy rainfall before emergence, it is advisable to delay application to early post-emergence for the best effect.
2. Safety Considerations: Application before emergence is the safest for wheat, while barley and rye may show slight sensitivity. Winter wheat tends to be safer compared to spring wheat. Early post-emergence application is generally safer than pre-emergence.
3. Weed Control in Winter Wheat Fields: Pyrifluquinazon has a broad spectrum of weed control, effectively managing most broadleaf weeds. It should be applied from the sowing period to early winter, as it has a long residual efficacy in the soil, which can also suppress later germinating weeds such as Pigweed, Persian Speedwell, and Violet, providing stable efficacy against spring-germinating weeds, largely unaffected by climatic conditions. However, applying before emergence during prolonged rainy periods, especially during the emergence phase, may temporarily discolor the crop’s leaves. Fortunately, the wheat will quickly recover. Wheat exhibits greater tolerance than barley and rye, while spring wheat has lower resistance compared to winter wheat. Early post-emergence application enhances safety.

Application Techniques of Pyrifluquinazon in Garlic

In garlic planting areas, pyrifluquinazon is employed as a new type of herbicide, mainly for closed weed control. It is an excellent herbicide that combines both pre-emergent and post-emergent actions, following dimethenamid-P, ethylfluorate, and paraquat.

Pyrifluquinazon exhibits significantly better efficacy than other pre-emergent herbicides against winter weeds such as Pigweed, Persian Speedwell, and Shepherd’s Purse. When mixed with dimethenamid-P or ethylfluorate, for instance, using 200 mL of 330 g/L dimethenamid-P emulsion + 30-60 mL of 30% pyrifluquinazon suspension in 30 kg of water for uniform spraying, it not only broadens the spectrum of weed control but also extends the period of effectiveness, reducing the weed burden in garlic fields while remaining safe for garlic growth.

Application Techniques of Pyrifluquinazon in Rice

For direct-seeded rice, pyrifluquinazon can be combined with butachlor for soil sealing treatments before seed emergence. In transplanted rice, using a 3% granular formulation of pyrifluquinazon at an application rate of 135-225 g (a.i.)/hm² can effectively control annual broadleaf weeds such as Polygonum hydropiper, Duck’s Tongue, and Oenanthe javanica. The herbicide significantly suppresses weed growth after application. Currently, various combinations of registered formulations are available for rice use, but the author opts not to elaborate due to limited field experience with these combinations.

Application Techniques of Pyrifluquinazon in Traditional Chinese Medicine

In traditional Chinese medicine, one of the most mature applications of pyrifluquinazon is in the cultivation of Angelica dahurica, which can be synchronized with wheat or garlic planting. For pre-emergent control, a mixture of dimethenamid-P and pyrifluquinazon can be used to reduce over 90% of winter weeds in the field.

For post-emergent weed control, it can be applied in combination with paraquat, addressing the limitation of post-emergent control primarily affecting young weeds, thus enhancing efficacy against weeds older than seedling stage while remaining safe for Angelica dahurica seedlings.