Pre-Emergent Herbicide | Do-It-Yourself Pest Control

Fall Herbicide Application

Fall pre-emergent applications are designed to prevent winter annual weeds. These weeds germinate during the fall months. Similar to spring applications, timing is very important to successfully prevent winter annual weeds from taking over your lawn. The best time to apply fall pre-emergent herbicides is late summer to early fall depending on your geographic location.

Annual Bluegrass (Poa Annua) is one of the most common winter annual weeds. Annual Bluegrass is a hardy weed, and may require multiple applications over consecutive seasons to achieve an acceptable level of control. Fall weeds being to germinate when soil temperatures starts to dip below 70 degrees (soil temperatures about 50 degrees). The best time to apply is the when the daytime highs drop to the mid-70s for about three to five days in a row.

Since a pre-emergent application will not last through the following summer, make a pre-emergent application late spring or early summer (see Spring Herbicide Application map).