Idaho's Noxious Weeds, 9th edition

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Idaho’s noxious weeds are plant species that have been designated “noxious” by law in the Idaho Code (title 22, chapter 24, “Noxious Weeds”). The weed law is implemented using administrative rules. These rules are contained in IDAPA (Idaho Administrative Procedures Act) 02, title 06, chapter 22, “Noxious Weed Rules.” Idaho’s noxious weed law is online at https://legislature.idaho.gov/statutesrules/idstat/Title22/T22CH24/. The administrative rules are online at https://adminrules.idaho.gov/rules/current/02/index.html. <br />

The weeds in this book are arranged alphabetically by weed common name. For weeds that have more than one common name, the book uses the name in Idaho’s official noxious weed list. The description for each weed includes the following: <br />

Weed name and family. Common and scientific names for the weed and its plant family. <br />

Category. The official category of an Idaho’s noxious weed— prohibited genera, early detection rapid response (EDRR), containment, or control. The category appears in a color-coded bar directly below family name. Maroon (reddish) signifies EDRR, blue containment, and gold control and prohibited genera. <br />

Poison. A poison symbol (skull and crossbones) in the category bar denotes weeds that are poisonous. <br />

Background. A summary of important information about the weed, including an indication of the distance seeds or other plant parts move. This dispersal distance can help you determine the size of the treatment area. This section also contains the length of time seeds survive. <br />

Description. Life history, height, and other overall features. Subsections follow that describe roots, leaves, flowers, and seeds. <br />

Habitat. Where the weed is most likely to occur. <br />

Similar plants. Plants that can be confused with the weed and ways to distinguish among them.
Idaho distribution map. Shows counties in which the weed was present in the ISDA database as of January 2010 and in the continually updated North American Vascular Flora Database by John T. Kartesz, Biota of North America Program. <br />

Photographs. Captions lead you to important distinguishing features of each weed. <br />

Leaf shape. The general outline of the weed’s leaves, minus leaf margin detail (such as a saw-like leaf edge) appears at bottom right. If a plant has more than one leaf shape, both are included, with “R” designating a rosette leaf and “S” a stem leaf.

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Reference Code: B18PRA01IDUS <br>

Full Citation: Prather, T., S. Robins, D. Morishita. 2018. Idaho's Noxious Weeds, 9th edition. Edition 9th. Moscow (Idaho): University of Idaho Extension. 152 pp. <br>

Location: ELECTRONIC FILE - BOTANY: OTHER <br>

Keywords: Idaho, noxious weeds <br>