Methiozolin

Methiozolin (250-4000 g a.i. ha^-1; foliar spray via CO₂ pressurised track sprayer delivering 300 L ha^-1 at 280 kPa) is safe for all tested turfgrasses at doses ≤1000 g a.i. ha^-1, with temporary, recoverable phytotoxicity observed at higher doses (2000-4000 g a.i. ha^-1) that resolves or declines by 6 weeks post-application^[1].
Methiozolin (500-2000 g ha^-1; foliar application) suppresses annual bluegrass seed head production in a dose-dependent manner, with greater reduction in panicle number than panicle length at equivalent doses, and >80% suppression of panicle number achieved at 2000 g ha^-1[1].
Methiozolin (500-2000 g ha⁻¹; foliar + soil spray; foliar-only spray; soil-only pipette application) has herbicidal activity against Poa annua entirely dependent on soil uptake, as foliar-only application provides no control, while soil-only application matches the efficacy of combined foliar + soil application^[1].
Methiozolin (500-1000 g a.i. ha^-1; foliar spray via handheld sprayer delivering 1000 L ha^-1; 3-week intervals; 12 times) provides the highest annual bluegrass control (~90-100%) when applied in the fall, with temporary, recoverable creeping bentgrass phytotoxicity that resolves by June, while spring applications provide lower control (40-60%) with no persistent injury^[1].