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