All three are identified by the bright purple flowering head, each with a different inflorescence. The three most common invasive thistle species are: Canada thistle, bull thistle, and plumeless thistle. Leaves are smooth above and hairy below. Control. When in meadows and pastures, grazing animals avoid plumeless thistle and focus on native plants giving the invasive the upper hand. Chemical control is the most widely used control method for these thistles. Plumeless thistle Carduus acanthoides Chemical control Herbicide: Weedar (2, 4-D amine) Description: Apply 2 to 4 pt/A 2,4-D amine Timing: Rosette to bolting stages Herbicide: Banvel, Clarity, Vanquish (dicamba) Description: Apply 0.5 to 1 lb ae/A dicamba Timing: Rosette stage Herbicide: Escort XP (metsulfuron) The rust hastens plant senescence and reduces seed production. Common names: spiny plumeless thistle, welted thistle; Ecological threat. Leaves: First year basal rosette leaves can be 20" long. Development and reproduction of the three thistle herbivores are not adversely affected by the rust. You can control poison hemlock by using 2,4-D or by hand pulling. Not noxious but is poisonous. Control You can control plumeless thistle by using Stinger, 2,4-D or Banvel. Hand pulling also works for control. Lace-like leaves. Plumeless and musk thistles will hybridize. Noxious Weeds of Nebraska: Plumeless Thistle ; Noxious Weeds of Nebraska: Canada Thistle ; Noxious Weeds of Nebraska: Musk Thistle Plumeless thistle is best controlled … The rust hastens plant senescence and reduces seed production. Habitat There are some biological controls that work on the thistles. Lobe tips have stout spines. Poison hemlock Stands upright. Umbrella-like flowers. Control of plumeless thistle with R. conicus and T. horridus takes approximately twice as long as control of nodding thistle. In: Van Driesche, R., et al.., 2002, Biological Control of Invasive Plants in the Eastern United States, USDA Forest Service Publication FHTET-2002-04, 413 p. Pest Status of Weed. Development and reproduction of the three thistle herbivores are not adversely affected by the rust. Plumeless thistle, Carduus acanthoides L., is an introduced Eurasian noxious weed in pastures, rangelands, croplands, and along highways in 19 of the contiguous states in the United States (Frick, 1978). Information Sheet (PDF) Colorado List B - Eradication required in Jefferson County. Spreads into high-quality prairies. Stems are spiny winged. Infest low-quality areas first, such as roadsides, disturbed areas, ditch banks and old fields. Plumeless thistle closely resembles musk thistle; however, the flowers are smaller and don’t nod, and the leaves are more deeply serrated with hairy undersides. Control of plumeless thistle with R. conicus and T. horridus takes approximately twice as long as control of nodding thistle. Plumeless thistle is a herbaceous biennial. Carduus acanthoides. Minnesota has many varieties of thistle species, some are native and others are invasive. Biennial (short-lived perennial) Family: Sunflower (Asteraceae) Herbaceous; Rosettes formed the first year and bolt early in May to June of the next year. Timing, as with other biennials, is very important in control. Any chemical that will control broadleaf weeds such as 2,4-D, and Tordon will control musk and plumeless thistle and leave the native grasses unharmed. General. The thistle head weevil, R. conicus, weevil provides only partial control of plumeless thistle, and has been documented to develop on native non-target thistles. Plumeless Thistle. 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