Tebuthiuron 80% WDG – Soil-Residual Herbicide for Total Vegetation Control

Tebuthiuron 80% WDG é um persistent urea herbicide formulated as a water-dispersible granule, designed for long-term suppression of broadleaf weeds, grasses, and woody plants in non-crop areas (industrial sites, railways) and select crops (sugarcane, pineapples). As a photosynthesis inhibitor (PSII, HRAC Group 5), it provides 1–2 years of residual control through root uptake and soil mobility, making it ideal for low-maintenance vegetation management .

Especificações técnicas

Parâmetro	Especificação
Ingrediente ativo	Tebuthiuron 80% (w/w)
Classe química	Substituted urea (PSII inhibitor)
Tipo de formulação	Grânulo Dispersível em Água (WDG)
Modo de ação	Blocks electron transport in PSII → disrupts photosynthesis
Target Vegetation	Broadleaves, grasses, shrubs (Cynodon, Amaranto, Acacia)
Solubilidade	Moderate (2,500 mg/L at 25°C)
Meia-vida do solo	DT₅₀: 180–360 days (persistent)
Prazo de validade	3 years (store at 10–30°C in dry conditions)

Critical Use Restrictions

Non-Selective: Total vegetation control – avoid near desirable plants.
Groundwater Hazard: High leaching risk (GUS index: 3.8) – prohibited in sandy soils or near aquifers .
Global Bans: Withdrawn in EU (2002) and Australia; restricted use in USA/Canada .

Diretrizes de aplicação

Usos Registrados:

Site	Dosagem (kg/ha)	Target Vegetation	Método
Industrial Sites	4.0–8.0	Brush, perennial grasses	Soil-surface broadcast
Sugarcane (Pre-plant)	2,0–3,0	Cynodon dactylon, Sorgo halepense	Incorporação no solo
Silvicultura	3.0–6.0	Woody invasives (Acacia)	Spot treatment

Principais Práticas:
⚠️ Ativação: Requires 25–50 mm rainfall within 10 days.
⚠️ Zonas de Amortecimento: 100m from water bodies, 500m from croplands.
⚠️ Single Application Limit: ≤8 kg/ha/year to reduce leaching risk .

Perfil Ambiental e de Segurança

Parâmetro	Dados	Status regulatório
Toxicidade em mamíferos	Moderate (Rat oral LD₅₀: 644 mg/kg)	Classe II da OMS (moderadamente perigoso)
Ecotoxicidade	Extremely toxic to fish (LC₅₀: 0.09 mg/L)	EPA Restricted Use Pesticide (RUP)
Ligação do solo	Koc: 80 (high leaching potential)	GUS index: 3.8 (high risk)
Intervalo de reentrada	48 horas	Full PPE mandatory

Vantagens e Limitações

Vantagens:
✅ Long-Term Control: 12–24 months suppression after single application.
✅ Custo-benefício: Reduces mechanical clearing by 80% in trials.
✅ Gerenciamento de resistência: Eficaz contra ervas daninhas resistentes ao glifosato.

Limitações:
⚠️ Non-Target Damage: Root zone migration kills adjacent vegetation.
⚠️ Persistência: Residual activity limits land reuse (wait 24+ months for sensitive crops).

Status regulatório global

Região	Status	Key Restrictions
EUA	Restricted Use (EPA Reg. No. 352-399)	Certified applicators only; groundwater monitoring
Canadá	Limited registration (PMRA Dir. 2017-01)	Prohibited in areas with <60 cm soil depth
UE	Banned (2002)	—
Brasil	Approved for sugarcane (2021)	Mandatory 500m crop buffers

Handling & Storage

Embalagem: 25 kg moisture-proof bags with inner liner.
Armazenamento: Secure, ventilated area; separate from food/feed.
Spill Response: Contain with absorbent material; collect in sealed containers.
Descarte: Incinerate at licensed facilities (>1,000°C) .