fluazifopP

Fluazifop-P is the propyl ester form of fluazifop acid, an herbicide in the aryloxyphenoxypropionate (AOPP) family. It is used to control grasses in a range of agricultural crops and in certain noncrop settings. Commercial products are often formulated as fluazipof-P esters that act as proherbicides, releasing the active acid upon uptake by the plant.

Mode of action: Fluazifop-P is a selective systemic herbicide that inhibits the enzyme acetyl-CoA carboxylase (ACCase) in susceptible grasses. Inhibition of ACCase blocks the production of malonyl-CoA and the fatty acid synthesis pathway, leading to disruption of membrane formation, inhibited growth, and necrosis in treated grasses. Broadleaf crops generally tolerate the compound due to differences in target-site sensitivity and/or metabolism.

Chemistry and formulations: The active ingredient is fluazifop acid. In many products, fluazifop-P is supplied as the butyl ester (fluazifop-P-butyl), which is hydrolyzed in the plant to the active acid. The lipophilic nature of the compound supports uptake and translocation, and formulations often include adjuvants to enhance efficiency and rainfastness.

Use and regulation: Fluazifop-P is registered for use in various crops where grass control is desired, including some oilseeds, cotton, and vegetables, among others. It is typically applied post-emergence to actively growing grasses. As with other herbicides, label directions, spray drift precautions, and local regulatory requirements should be followed. Resistance risk exists with repeated use, so integrated weed-management practices are recommended.