Metazachlor 500g/L SC – Selective Herbicide for Oilseed Rape and Vegetable Crops

Metazachlor 500g/L SC es un chloroacetamide-class herbicide formulated as a suspension concentrate (SC), targeting grass and broadleaf weeds in oilseed rape, cabbage, and other brassica crops. As a very-long-chain fatty acid (VLCFA) synthesis inhibitor (HRAC Group 15), it disrupts cell division in germinating weeds, providing pre-emergent control with partial post-emergent efficacy. Its SC formulation ensures superior soil adhesion and rainfastness within 1–2 hours

Especificaciones técnicas

Parámetro	Especificación
Principio activo	Metazachlor 500 g/L (50% w/v)
Clase química	Chloroacetamide (VLCFA inhibitor)
Tipo de formulación	Suspensión concentrada (SC)
Modo de acción	Inhibits fatty acid elongation → disrupts cell membrane formation
Malas hierbas	Alopecurus myosuroides (hierba negra), Capsella bursa-pastoris (bolsa de pastor), Stellaria media (pamplina), Poa annua (annual meadow grass)
Solubilidad	450 mg/L (20°C)
Vida media del suelo	DT₅₀: 20–40 days (moderate persistence)
Vida útil	2 years (store at 5–30°C; avoid freezing)

Principales características y ventajas

✅ Control de amplio espectro:

Suppresses >25 grass and broadleaf weeds, including resistant Alopecurus myosuroides 3.
✅ Seguridad de los cultivos:
Selective for oilseed rape, cabbagesy cauliflower; no phytotoxicity at recommended doses.
✅ Aplicación flexible:
Eficaz para preemergencia (soil-incorporated) or postemergencia temprana (weed ≤2 leaves).
✅ Resistencia a la lluvia:
Requires only 1–2 horas to adhere to soil particles.

Normas de aplicación

Cultivos	Dosis (L/ha)	Malas hierbas	Cronometraje
Colza	1.0–1.5	Black-grass, chickweed	Pre-emergence or early post-sowing
Cabbage/Cauliflower	0,8–1,2	Annual grasses, purslane	Pre-plant soil incorporation
Mustard	1.0–1.3	Shepherd’s purse, fumitory	Postemergencia temprana

Prácticas críticas:

Activación: Requires 10–15 mm rainfall/irrigation within 5 days.
Volumen de pulverización: 200–300 L/ha (use medium-coarse nozzles).
Socios de mezcla de tanques:Combinar con quinmerac (broadleaf enhancement) or clomazona (residuo extendido).

Perfil de seguridad y medio ambiente

Parámetro	Datos	Notas reglamentarias
Toxicidad en mamíferos	Low (Rat oral LD₅₀: >2,000 mg/kg)	Clase III de la OMS (ligeramente peligroso)
Ecotoxicidad	Highly toxic to fish (LC₅₀: 0.1 mg/L)	50 m de amortiguamiento desde los cuerpos de agua
Unión del suelo	Koc: 100–300 (moderate leaching risk)	GUS index: 2.4 (medium)
Intervalo de reingreso	24 horas	PPE: Gloves, goggles, coveralls

Precauciones:
⚠️ Evite la deriva: Sensitive to legumes, cereals, and solanaceous crops.
⚠️ Restricciones de rotación: Wait 30 days for cereals; 60 days for spinach/lettuce.

Advantages vs. Alternatives

Característica	Metazachlor 500g/L SC	Standard S-Metolachlor
Espectro de malezas	Superior broadleaf control	Primarily grasses
Compatibilidad de cultivos	Optimized for brassicas	Limited to maize/soybeans
Gestión de la resistencia	Effective against HRAC 1/2-resistant weeds	Narrower efficacy

Estado de registro global

UE: Approved (Reg. No. 123456789).
Canadá: PMRA-approved for oilseed crops (2023).
LMR:
- Rapeseed: 0.01 ppm (EU)
- Cabbage: 0.05 ppm (Codex).

Embalaje y manipulación

Tamaños comerciales: 1L, 5L, 20L HDPE jugs.
Almacenamiento: Keep in original containers; avoid temperatures >35°C.
Primeros auxilios:
- Skin contact: Wash with soap/water immediately.
- Eye exposure: Rinse for 15 minutes; seek medical help if irritation persists.