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Biology and Management of the Toadflaxes <br />Pag <br />q¢Rnoi!Ieil¢c ro~H`ork ~ ;~ .. ~ ~' <br />A-H /Youth Agdculture Fatuity/Consumer Horticulture Natural Resources Nutrttbn Resources Home <br />no. 3.114 <br />Biology and Management of the <br />Toadflaxes <br />by K.G. Beck. t <br />Quick Facts... <br />Yellow toadflax (Linaria vulgaris) and the Dalmatian toadflaxes (Linaria dalmatian <br />and Linaria genistifolia) are invasive, perennial weeds that are noxious in Colorado <br />and other western states. <br />Seeds of yellow toadflax germinate and emerge in early to mid-May while <br />Dalmatian toadflax seeds may germinate and emerge earlier, especially on south <br />or southeast facing slopes. <br />Dalmatian toadflax may be controlled with Tordon 22K at 2 pt/A sprayed at <br />flowering or in fall. Yellow toadflax (Linaria vulgaris) and the Dalmatian toadflaxes <br />(Linaria dalmatian and Linaria genistifolia) are invasive, perennial weeds that are <br />noxious in Colorado and many other western states. Toadflax invasion is favored <br />by disturbance and they invade degraded areas such as roadsides, abandoned Tots <br />and fields, gravel pits, clearings, and overgrazed rangeland. In Colorado, these <br />weed species are found at elevations from 5,000 feet to over 10,000 feet. Yellow <br />toadflax in particular has spread into high mountain valleys and parks. Yellow <br />toadflax infests 40,800 acres in Colorado and Dalmatian toadflax infests 34,200 <br />acres. <br />Origin and History <br />The toadflaxes have a storied past and a long <br />relationship with humans. Dalmatian toadflax is native <br />to the Mediterranean region. Broad-leaved Dalmatian ,~ <br />toadflax (L, dalmatian) has been cultivated as an <br />ornamental for at least 400 years. It was introduced <br />into the western U.S. as an ornamental in 1874. The <br />majority of Dalmatian toadflax infestations in the west f <br />are broad-leaved Dalmatian toadflax; however in its <br />native Eurasian habitat, narrow-leaved Dalmatian <br />toadflax (L. genistifolia) is more widespread, <br />indicating its potential to also invade and become <br />widely dispersed in the U.S. Narrow-leaved Dalmatian ~ ~ - `~ .,~ <br />toadflax currently infests several areas in western <br />Oregon, northwestern Washington, British Columbia, , <br />and possibly in Colorado. ,.~ .a; <br /> <br />Yellow toadflax is native to south-central Eurasia __ <br />' : `~ <br /> <br />where it was used for fabric dyes and for medicinal _ <br />` `" <br />purposes. It was imported into North America in the _ s. <br />late 1600s as an ornamental and for folk remedies. It <br />http:/lwww.ext.colostate.edu/pubs/natres/03114.htm1 6/20!2005 <br />