Quinclorac (chemical name: 3,7-dichloroquinoline-8-carboxylic acid) is a selective systemic herbicide belonging to the quinoline carboxylic acid family. Common drying method: LPG is widely used in liquid shaping and drying
Quinclorac (chemical name: 3,7-dichloroquinoline-8-carboxylic acid) is a selective systemic herbicide belonging to the quinoline carboxylic acid family. It is widely used in agriculture, particularly in rice paddies, turfgrass, and non-crop areas, to control a broad spectrum of broadleaf and grassy weeds. The term "Quinclorac drying" refers to its unique herbicidal mechanism, which accelerates plant dehydration and desiccation, leading to weed death.
Mode of Action
Quinclorac functions by disrupting hormonal balance in susceptible plants. As a synthetic auxin mimic, it mimics natural auxins (e.g., indoleacetic acid) but cannot be metabolized properly by target weeds. Key processes include:
Abnormal Cell Growth: Induces uncontrolled cell division and elongation, causing vascular system blockage.
Ethylene Biosynthesis: Triggers excessive ethylene production, accelerating senescence and tissue degradation.
Rapid Dehydration: Disrupts cell membrane integrity, leading to rapid water loss, wilting, and characteristic "drying" of leaves and stems.
Application Features
Broad-Spectrum Efficacy: Highly effective against stubborn weeds such as barnyardgrass (Echinochloa crus-galli), sedges, and crabgrass, especially in rice fields.
Selectivity: Safe for crops like rice and certain turfgrasses (e.g., Zoysia spp.) at recommended doses but toxic to broadleaf crops (e.g., soybeans, cotton).
Systemic Translocation: Absorbed via roots and foliage, with bidirectional movement within plants for thorough control.
Common drying method:
LPG is widely used in liquid shaping and drying, especially for producing solid products like powder, granules, or blocks from solutions, emulsions, suspensions, and pumped pastes.
Usage Considerations
Environmental Factors: Optimal efficacy requires adequate soil moisture; avoid application before rainfall to prevent runoff.
Resistance Management: Prolonged solo use may trigger weed resistance; rotate with herbicides of different modes of action (e.g., ALS inhibitors).
Phytotoxicity Risks: Drift or misuse can damage non-target crops (e.g., Solanaceae, Brassicaceae).
Environmental and Safety Profile
Persistence: Moderate soil persistence (half-life ~20–30 days), necessitating careful planning for subsequent crops.
Toxicity: Low mammalian toxicity (rat acute oral LD₅₀ > 5000 mg/kg) but requires adherence to safety intervals to protect aquatic ecosystems.