S-Metolachlor

Often the best way to deal with these type of invasive weeds is to prevent them from growing to begin with via pre-emergent. A solid pre-emergent active ingredient that does well against these weed types goes by the name of S-Metolachlor.

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

What is S-Metolachlor?

Metolachlor or S-metolachlor is a selective and systemic herbicide that works pre-emergently to control weeds and was first used to control weeds in agricultural settings on corn, cotton, soybean 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 a problem, particularly on warm-season grasses.

How Does S-Metolachlor Work?

Mode of Action

S-Metolachlor works by inhibiting the growth of long-chain fatty acids of target weeds. This results in a halt in the growth of seeding shoots which causes the weed to not germinate and sprout out of the soil.

Benefits of S-Metolachlor

Metolachlor herbicides offer an excellent residual and increased weed control with lower product use rates when compared to other pre-emergent herbicides. 

Drawbacks of S-Metolachlor

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

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 the product has totally dried.

What To Expect

After applying S-Metolachlor to target areas, the products begins 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 would like 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 a 1/2 inch of water if rainfall does not take place within 7 days of treatment.

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