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