Flumioxazin contact herbicide for broadleaf weed control

Flumioxazin is a contact herbicide absorbed by foliage or germinating seedlings producing symptoms of wilting, necrosis and chlorosis within 24 hours of application. It controls annual and biennial broadleaf weeds and grasses; in regional studies in America, flumioxazin was found to control 40 broadleaf weed species either pre- or post-emergence. The product has residual activity lasting up to 100 days depending on conditions.

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Flumioxazin is a contact herbicide absorbed by foliage or germinating seedlings producing symptoms of wilting, necrosis and chlorosis within 24 hours of application. It controls annual and biennial broadleaf weeds and grasses; in regional studies in America, flumioxazin was found to control 40 broadleaf weed species either pre- or post-emergence. The product has residual activity lasting up to 100 days depending on conditions. Flumioxazin acts by inhibition of protoporphyrinogen oxidase, an enzyme important in the synthesis of chlorophyll. It is suggested that porphyrins accumulate in susceptible plants, causing photosensitization that leads to membrane lipid peroxidation. The peroxidation of membrane lipids leads to irreversible damage of membrane function and structure in susceptible plants. The activity of flumioxazin is light and oxygen-dependent. Treatment of soil with flumioxazin will cause susceptible emerging plants to turn necrotic and die shortly after exposure to sunlight. Flumioxazin can be used as a burndown treatment in reduced tillage cultivation systems in combination with glyphosate or other post-emergence products including Valent’s Select (clethodim). It can be applied prior to planting up to emergence of the crop but will cause severe damage to soybean if applied post-emergence of the crop. The product is highly selective to soybean and peanut when applied pre-emergence. In soybean field trials, flumioxazin gave equal or better control than metribuzin but at very much lower application rates. Flumioxazin can be tank mixed with clethodim, glyphosate, and paraquat for burndown application on peanuts, and can be tank mixed with dimethenamid, ethalfuralin, metolachlor, and pendimethalin for pre-emergence use on peanuts. For use on soybeans, flumioxazin can be tank mixed with clethodim, glyphosate, imazaquin, and paraquat for burndown applications, and with clomazone, cloransulam-methyl, imazaquin, imazethapyr, linuron, metribuzin, pendimethalin for pre-emergence applications. In vineyards, flumioxazin is primarily for application pre-emergence of weeds. For post-emergence applications, mixtures with foliar herbicides are recommended. The product is only recommended for use on vines that are at least four years old.

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