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Last Updated: 7/31/2026

QuinStar® 4L

Active Ingredient: Quinclorac

2×2.5 gal

QuinStar® 4L is a systemic herbicide with plant uptake through both foliage and roots. Herbicide symptoms on susceptible plants includes twisting, stunting, reddening and chlorosis. On annual weeds, symptoms may take up to two weeks after application to develop, with death occurring in about three weeks. On perennial weeds, symptoms may not be evident for several weeks after application. Full effect may not be evident for 3-6 months.

Compare to: Facet®; Paramount®

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    • Formulated as a liquid flowable designed for dilution with water and spraying with common agricultural spray equipment.
    • Provides control or suppression of a range of annual and perennial grass and broadleaf weeds, including barnyardgrass (and propanil-resistant biotypes), crabgrass, morningglory, field bindweed, hemp sesbania, dandelion and common ragweed.
    • Low probability of selecting for resistant biotypes when used in a rotation with herbicides containing different modes of action.
    • May be used for weed control in dry-seeded, water-seeded and Clearfield® rice planting and production cultures.

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