News Flash Home
The original item was published from 8/17/2022 9:59:27 AM to 11/5/2022 12:00:03 AM.

News Flash

Press Releases

Posted on: August 17, 2022


Phragmite photo with contractor worker standing in front, Napier/10 Mile Road

The Road Commission for Oakland County (RCOC) continues to work with the Oakland County Cooperative Invasive Species Management Area (CISMA) organization to address invasive species growing along roads throughout Oakland County.   

Starting this month through October, state-licensed commercial applicators will apply an herbicide to knotweed and Phragmites located along RCOC roadways. On the day of treatment, yellow signs will be posted to indicate what products were used, specific restrictions and when the application took place. Additionally, private property owners adjacent to the treatment areas will be notified in advance by the commercial applicator.  

Phragmites grows in wet areas and can reach heights of 15 feet, leading to safety and environmental problems. It forms dense stands blocking views at intersections, impedes water access, impairs drainage, damages infrastructure, crowds out habitat and causes hot, damaging fires if ignited. Knotweed spreads easily when cut and can damage infrastructure including buildings and roads.

During application, the licensed applicator will apply the treatment from vehicle-mounted hand spray equipment or utilizing a backpack sprayer. The public is advised not to enter treated areas until the spray has dried.

The only effective means to deal with knotweeds and Phragmites is to chemically treat them utilizing a state-licensed commercial applicator. Cardno Inc., of West Olive, Michigan, will treat both Phragmites and knotweed. Additionally, PLM Lake and Management Corporation, of Morrice, Michigan, and GEI Consultants of Michigan, from Allendale, will focus on treating Phragmites.  

The chemicals used are registered by the United States Environmental Protection Agency (EPA). The areas to be treated along RCOC roads can be found at .

For a list of CISMA members and supporting partners, visit For more information or questions, contact RCOC by calling (877) 858-4804 or by email at


Facebook Twitter Email

Other News in Press Releases