Pretilachlor

Pretilachlor丨CAS 51218-49-6 is a selective pre-emergent herbicide from the chloroacetamide group, widely used in rice cultivation to control a broad spectrum of annual grasses, sedges, and some broadleaf weeds. Registered under CAS number 51218-49-6, pretilachlor is especially valued in flooded rice fields due to its high selectivity, low phytotoxicity, and long-lasting residual control.

A. Rice (Paddy) Cultivation

Primary crop: Lowland transplanted or direct-seeded rice

Applied as pre-emergent or early post-emergent treatment, typically 0–5 days after transplanting or sowing

Target weeds:

Grasses: Echinochloa crus-galli, Leptochloa chinensis, Ischaemum rugosum

Sedges: Cyperus difformis, Fimbristylis miliacea

Broadleaf weeds: Eclipta alba, Monochoria vaginalis

B. Application Methods

Soil incorporation not required; effective under flooded or moist conditions

Available in granular, emulsifiable concentrate (EC), and suspension concentrate (SC) formulations

Can be applied alone or in combination with other herbicides (e.g., bensulfuron-methyl or pyrazosulfuron) for broader spectrum control

A. High Selectivity for Rice

Safe to transplanted rice when used at recommended rates

Does not harm rice seedlings even in delicate growth stages

B. Broad-Spectrum Control

Controls both annual grasses and some sedges/broadleaf weeds

Reduces early weed competition, enhancing rice stand establishment

C. Long Residual Activity

Effective for 3–4 weeks after application under normal field conditions

Reduces need for repeated applications, lowering labor and costs

D. Cost-Effective and Labor-Saving

Particularly valuable in labor-scarce rice-growing regions

Reduces dependency on manual or mechanical weeding in early crop stages

E. Formulation Versatility

Available in granular form (e.g., 5G) for easy broadcasting without water

SC and EC formulations allow flexible application techniques like spraying or mixing

Pretilachlor丨CAS 51218-49-6 is a vital herbicide in modern rice production, offering broad-spectrum weed control, selectivity, and residual activity at low cost. Its flexibility in application and compatibility with integrated weed management programs make it an essential tool in sustainable rice farming. However, to ensure long-term effectiveness and environmental safety, it should be used responsibly with attention to rotation and drift management.

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