S-Metolachlor

Often, the best way to deal with these types of invasive weeds is to prevent them from growing in the first place via pre-emergent. A solid pre-emergent active ingredient that does well against these weed types is S-Metolachlor.

On this page, we will share background information about S-Metolachlor, its mode of action, and its benefits. 

What is S-Metolachlor?

Metolachlor or S-metolachlor is a selective and systemic herbicide that works pre-emergently to control weeds. It was first used to control weeds in agricultural settings on corn, cotton, soybeans, and other crops. 

While this active ingredient has been the most useful in protecting crops against weeds, it can also be used in commercial and residential areas where weeds are problematic, particularly on warm-season grasses.

How Does S-Metolachlor Work?

Mode of Action

S-Metolachlor inhibits the growth of long-chain fatty acids in target weeds. This results in a halt in the development of seeding shoots, which prevents the weed from germinating and sprouting out of the soil.

Benefits of S-Metolachlor

Metolachlor herbicides offer excellent residual, increased weed control, and lower product use rates than other pre-emergent herbicides. 

Drawbacks of S-Metolachlor

With S-Metolachlor being a pre-emergent, timing is essential. If the weeds you want gone have already sprouted, the product will not kill the established weed. You will have to use a post-emergent herbicide instead.

Is S-Metolachlor Safe?

S-Metolachlor is safe to use when applied according to label directions. Please wear the proper PPE (personal protective equipment) before mixing and applying S-Metolachlor-based products. These include protective eyewear, gloves, long-sleeved clothing, and a safety mask. After applying the product, keep people and pets off the treated area until it has totally dried.

What To Expect

After applying S-Metolachlor to target areas, the products begin to work immediately, and you should expect weed seeds in the soil to be unable to germinate. Weed seeds can be controlled for up to 60 days. Reapply after 60 days for season-long control.

Timing is crucial when applying pre-emergents to the area where you want weeds controlled. It is best to apply S-Metolachlor products in the early spring before green-up. Soil moisture is necessary to activate the problem, so irrigate with 1/2 inch of water if rainfall does not occur within 7 days of treatment.

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