Pyroxasulfone CAS 447399-55-5

Trifenapyr is a novel pyrazole selective herbicide, which is used to control the main grass and broadleaf weeds in dryland crop fields by pre-emergence application. It has a wide range of application times, from pre-plant to post-emergence, and is compatible with most commonly used herbicides.

The mechanism of action is that the biosynthesis of very long-chain fatty acids (VLCFAs) can be greatly reduced after treatment with sulfofenazone and lead to the construction of fatty acid precursors. Meafenazole specifically inhibits many of the elongation steps catalyzed by VLCFAs elongases. Through the indoor activity test and field efficacy test, the results show that 40% sulfofenazone suspending agent is effective against winter wheat field brome, kangaroo, wild oat, and other annual grass weeds, as well as artemisia spp. Some annual broad-leaved weeds have a good control effect. During the period from the sowing of winter wheat to the 1.5-leaf stage of grass weeds, the soil moisture is good or after irrigation and rainfall, add 30-40 L/mu of water, and carry out soil spraying or weeding. In the early post-emergence stem and leaf spray treatment, especially the soil spray treatment has the best control effect. Suitable for use in non-rice-wheat rotation winter wheat fields.

Use at most once in the whole growing season of wheat. It is safe to crops within the dosage range, and no phytotoxicity has occurred. It has no effect on predatory natural enemies and parasitic natural enemies. 40% sulfofenazone suspending agent to control annual grass weeds such as brome and small broad-leaved weeds, the highest formulation dosage is 210 g a.i./hm2, and the maximum application is once. According to the measured data and risk assessment results, The proposed maximum residue limit (MRL) is 0.1 mg/kg, and the safe interval can be suggested as the harvest period.