Control. Spreads into high-quality prairies. The first three offer biology, identification, distribution information, including illustrated growth cycles and photos to aid in plant and pest identification, and control recommendations. All three are identified by the bright purple flowering head, each with a different inflorescence. Lace-like leaves. Plumeless Thistle. You can control poison hemlock by using 2,4-D or by hand pulling. Not noxious but is poisonous. Stems are spiny winged. Control You can control plumeless thistle by using Stinger, 2,4-D or Banvel. Flowering plants can range from 1-7' tall. Timing, as with other biennials, is very important in control. Lobe tips have stout spines. The rust hastens plant senescence and reduces seed production. Leaves are smooth above and hairy below. Plumeless thistle is best controlled … Infest low-quality areas first, such as roadsides, disturbed areas, ditch banks and old fields. The musk thistle crown weevil, T. horridus , is reported to be very effective against plumeless thistle, although control is … Leaves: First year basal rosette leaves can be 20" long. Common names: spiny plumeless thistle, welted thistle; Ecological threat. Control of plumeless thistle with R. conicus and T. horridus takes approximately twice as long as control of nodding thistle. 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. Hand pulling also works for control. The rust hastens plant senescence and reduces seed production. 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. General. Umbrella-like flowers. Habitat 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. Plumeless and musk thistles will hybridize. Carduus acanthoides. 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, 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). 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. When in meadows and pastures, grazing animals avoid plumeless thistle and focus on native plants giving the invasive the upper hand. Poison hemlock Stands upright. Development and reproduction of the three thistle herbivores are not adversely affected by the rust. Development and reproduction of the three thistle herbivores are not adversely affected by the rust. Information Sheet (PDF) Colorado List B - Eradication required in Jefferson County. The three most common invasive thistle species are: Canada thistle, bull thistle, and plumeless thistle. Noxious Weeds of Nebraska: Plumeless Thistle ; Noxious Weeds of Nebraska: Canada Thistle ; Noxious Weeds of Nebraska: Musk Thistle 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) 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. 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