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

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