Vanessa Otero
5/1/13
List A Species;
Yellow starthistle;
It is a winter annual that is blue-green color
A vigorous taproot, and produces bright yellow flowers, with stiff spines
Extend up to ¾ of an inch long
Basal leaves are 1-3 inches long and deeply lobed while upper leaves are smaller
Yellow starthistle typically germinates in the fall with increased moisture
It can germinate extremely fast with optimal conditions throughout the entire summer
It also destroys native plant communities
The key to effective control of yellow starthistle is to prevent seed set from occurring in
Existing populations, monitoring your land for new infestations frequently
Yellow starthistle is designated as a “List A” species in the Colorado Noxious Weed Act.
http://www.colorado.gov/cs/Satellite?blobcol=urldata&blobheadername1=Content-Disposition&blobheadername2=Content-Type&blobheadervalue1=inline%3B+filename%3D%22Yellow+starthistle+Fact+Sheet.pdf%22&blobheade
rvalue2=application%2Fpdf&blobkey=id&blobtable=MungoBlobs&blobwhere=1251847200235&ssbinary=true
List B Species;
Venice Mallow;
A summer annual forb that has a spreading profile and is native to Europe.
Seeds; Dark brown, can remain viable for 50 years
Leaves; approximately 3 inches wide long
Upper surface is NOT hairy, under of the leaf is hairy
The 5 petal flowers appear from July through September
Venice Mallow is found mainly amongst agriculture crops, making it difficult to control
The key to effective control of Venice Mallow is preventing establishment of the plant and seed production
Venice Mallow is designated as a “List B” species in the Colorado Noxious Weed Act
It is required to be eradicated, contained, or suppressed
http://www.colorado.gov/cs/Satellite?blobcol=urldata&blobheadername1=Content-Disposition&blobheadername2=Content-Type&blobheadervalue1=inline%3B+filename%3D%22Venice+mallow+Fact+Sheet.pdf%22&blobheadervalue2=application%2Fpdf&blobkey=id&blobtable=MungoBlobs&blobwhere=1251847198054&ssbinary=true
List C Species:
Halogeton;
Annual forbs native to Asia
Few inches off the ground to 18 inches tall
Beginning as a bluish-green color in the spring, turning reddish-yellow later in the
Summer
Leaves are small, and fleshy in nature
Halogeton reproduces by seeds
Black colored seeds reproduce in same season
Sheep seem to be most affected by the toxic oxalates, cows can also be affected.
Plant populations have been present for more than 2 years, since seeds can stay viable up to 10 years.
Effective control of Halogeton is preventing the
Plant to establish viable populations. Halogeton does not outcompete native vegetation, so maintaining and renegotiating sites that are overgrazed are effective management tools
http://www.colorado.gov/cs/Satellite?blobcol=urldata&blobheadername1=Content-Disposition&blobheadername2=Content-Type&blobheadervalue1=inline%3B+filename%3D%22Halogeton+Fact+Sheet.pdf%22&blobheadervalue2=application%2Fpdf&blobkey=id&blobtable=MungoBlobs&blobwhere=1251851178511&ssbinary=true