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Orellia ruficauda feeds on Canada thistle and has been reported to be the most effective biological control agent for that plant. [41] Its larvae parasitize the seed heads, feeding solely upon fertile seed heads. [42] The weevil Larinus planus also feeds on the thistle and has been used as a control agent in Canada. [43]
Milk thistle flowerhead Cirsium arizonicum, showing arachnoid cobwebbiness on stems and leaves, with ants attending aphids that might be taking advantage of the shelter. Thistle is the common name of a group of flowering plants characterized by leaves with sharp spikes on the margins, mostly in the family Asteraceae. Prickles can also occur all ...
Cirsium vulgare (spear thistle) is listed in the United States (where as a non-native invasive species it has been renamed "bull thistle") as a noxious weed in nine states. [6] Some species in particular are cultivated in gardens and wildflower plantings for their aesthetic value and/or to support pollinators such as bees and butterflies.
Cirsium discolor, the field thistle, [2] is a North American species of plants in the tribe Cardueae within the family Asteraceae. It is native to thirty-three states in the United States as well four Canadian provinces. [3] It occurs across much of eastern and central Canada as well as eastern and central United States.
The Cardueae are a tribe of flowering plants in the daisy family and the subfamily Carduoideae. [5] Most of them are commonly known as thistles; [6] four of the best known genera are Carduus, [7] Cynara (containing the widely eaten artichoke), Cirsium, [7] and Onopordum.
In Canada, it has been used as an agent of biological pest control against the noxious weed Canada thistle (Cirsium arvense). It was subsequently evaluated in the United States as a biocontrol agent and distributed across a range of the Great Plains in the western United States .
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Aceria anthocoptes, also known as the russet mite, [1] rust mite, [2] thistle mite or the Canada thistle mite, [3] is a species of mite that belongs to the family Eriophyidae.It was first described by Alfred Nalepa in 1892.