Don’t be worried if someone with a backpack is spraying weeds on U.S. Forest Service property.

The agency is trying to eradicate, control and contain known infestations of invasive plants in the Lake Tahoe Basin by using chemical treatment. The work will occur at about 70 sites between May 15 and Sept. 30.

Project areas include: the 64 Acres parking lot, Angora burn area, Baldwin Beach Meadow, Burke Creek trail, Camp Richardson Corral, Luther Pass Campground, Heavenly Creek Meadow, Heavenly Mountain Resort, Rabe Meadow, Lower Truckee River below Tahoe City, and the Spooner Summit fire station.

Crews will treat infestations on Forest Service urban lots on Ralph Drive, Terry Lane, Ski Run Boulevard and Mt. Rainier Drive in South Lake Tahoe; and on Sugar Pine Drive in Incline Village; Marge Court in Zephyr Cove; and Pine Street in Stateline.

Herbicides used in treatments include Rodeo, Milestone and Telar. Crews will apply the product with backpack sprayers and other hand held tools. Caution signs will be posted in treatment areas and remain for at least 48 hours after application. Orange and black caution tape will mark the boundary around each treatment area. A marker dye will be used to identify locations that have been sprayed.

Access to treatment sites will be restricted during and after the application.

Target invasive plants include tall whitetop, Dalmatian toadflax, yellow toadflax, hoary cress and Canada thistle.