Carson Water Subconservancy District targets ‘Tall Whitetop’
The Carson Water Subconservancy District is warning the public about harmful and invasive plants during Invasive Weed Awareness Month in the Carson River Watershed.
Each year, CWSD amplifies its public education outreach regarding the risks that invasive plants and weeds pose to Nevada’s crops, forests and public lands. The goal is to help the public prevent the spread of invasive weeds. These non-native, destructive species can seriously harm the economy, environment, or even human and animal health.
One of the most common invasive weeds in the area is Perennial Pepperweed (Lepidium latifolium). Commonly known as “Tall Whitetop,” It can grow up to 6 feet tall and has a deep intricate root system. Pepperweed can produce close to one million seeds per plant, and also reproduces through the plants root system. It is commonly found in moist areas around floodplains, pastures, meadows and waterways.
The best way to control the spread of this invasive plant is through mechanical and chemical methods. Mowing prevents seed formation and depletes food production in the plant, but does not kill it. Avoid cultivation and plowing. Using chemical herbicides followed by seeding with a competitive crop or a rootstock grass is ideal. A combination of both treatments gives the best results. Burning may be used to remove older decadent materials which will allow for an herbicide application.
With the help of the community, CWSD would like to greatly reduce and limit the spread of this harmful and invasive plant.
If you need assistance in identifying an invasive weed or potential treatment options you may contact the local University of Nevada Cooperative Extension office.