NOXIOUS AND INVASIVE WEED CONTROL
Noxious and invasive weeds are widespread throughout Nevada. Noxious weeds have already invaded thousands of acres of Nevada’s lands and waterways and threaten water quality, wildlife habitat, recreational activities and the economic stability of ranchers, farmers and other land managers.
WHAT IS A NOXIOUS WEED?
A "noxious weed" is defined as any species of plant that is, or is likely to be, detrimental or destructive and difficult to control or eradicate (Nevada Revised Statute [NRS] 555.010-555.220). Noxious weeds and non-native invasive plant species have become a growing concern in Nevada.
Noxious weeds and non-native invasive plant species have the ability to readily establish and spread rapidly, particularly in disturbed areas. They are spread by a variety of means, including: vehicles, construction equipment, construction and reclamation materials, livestock, wildlife and wind. Vehicle traffic is a major contributor to weeds invading a new area because seeds and plant parts can become embedded in tire treads and any mud carried on a vehicle from an infested area. Weeds often establish themselves along roadways. Road maintenance activities, such as grading and adding gravel to roads, also is a means of spreading noxious weeds and non-native invasive plant species to roadside shoulders and ditches. Animals also can spread seeds and plant parts that attach to their hair or fur and get caught in their hooves.
NOXIOUS WEED CATEGORIES
Noxious weeds are classified into three categories: A, B, and C. Each category has specific control requirements, with the most stringent requirements for those species found in Category A.
Category A noxious weeds include weeds which are:
- Generally not found or are limited in distribution throughout the state;
- Actively excluded from the state and actively eradicated wherever found; and
- Controlled by the state for all infestations.
Category B includes noxious weed species, which are:
- Generally established in scattered populations in some counties of the state;
- Actively excluded where possible; and
- Controlled by the state in areas where populations are not well established or previously unknown to occur.
Category C includes noxious weeds, which are:
- Currently established and generally widespread in many counties of the state; and
- Controlled and abated at the discretion of the state quarantine officer (Nevada Department of Agriculture 2006).
One noxious weed that is causing significant problems with water resources throughout Nevada is tamarisk (Tamarix spp.) also known as saltcedar. Tamarisk, an introduced species, is known for its enormous consumption of water. It is estimated that a single mature tamarisk plant can consume 200 to 300 gallons of water per day. In addition to monopolizing limited sources of water, tamarisk exudes salt from its leaves which changes the chemistry of the surrounding soil, making it difficult for understory plants to establish, compete, and survive (from: Joining Forces to Fight Tamarisk in Nevada).
BROCHURES AND EDUCATIONAL MATERIALS
Nevada Department of Agriculture
Tri-County Weed Control Management Area (Lincoln, Nye, and White Pine Counties)
University of Nevada, Reno