flumioxazin (Chateau SW)

Flumioxazin (Chateau SW)
WSSA Group 14: protoporphyrinogen oxidase (PPO) inhibitor

Chateau has both pre- and early post-emergence activity and can control broadleaf weeds up to about 2 inches tall. If weed emergence is significant or weeds are large, consider mixing flumioxazin with an approved post-emergence herbicide to improve control.
The preferred time for pre-emergence applications is fall, in order to maximize the potential for rain to activate the herbicide. Do not apply to vines established less than 2 years, unless they are trellised at least 3 ft from the ground, and protected by nonporous wraps, grow tubes, or waxed containers. Do not apply to non-trellised vines unless they are free-standing. New plantings of own-rooted varieties should have root systems a minimum of 8 inches below the soil surface. Chateau should not be applied to soils that are susceptible to dispersal by wind; wind-blown, herbicide-treated soil can cause serious injury to grapes and other plants. Do not apply after budbreak through final harvest in juice and wine grapes, unless using shielded application equipment and applicator can ensure spray drift will not come in contact with crop fruit or foliage. Dust created by mowing can also injure sensitive species; do not mow between budbreak and final harvest. The application and maximum use rates can vary with weed species and soil type, but will not exceed 12 oz of formulated product per acre per application and 24 oz of formulated product per acre per year. Do not apply within 60 days of harvest. Do not apply within 300 yards of non-dormant pears.

No weed species are resistant to this mode of action documented to occur in ID, OR, or WA; data from Heap, I.
The International Survey of Herbicide Resistant Weeds. Available at www.weedscience.org

Usage for flumioxazin on Grapes

Pre-Emergence (Weeds)

Post-Emergence (Weeds)