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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]
The fly starts life as an egg, one to thirty of which are laid on the stems of its host plant, the Canada or creeping thistle (Cirsium arvense), during the host's growing season. After hatching, the larvae burrow into the stem and form a gall (or swelling). The larvae grow to reach 98% of their full adult body weight, and overwinter in the gall ...
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.
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.
They are a type of natural vegetative reproduction in many species, e.g. many grasses, quaking aspen and Canada thistle. The Pando quaking aspen grew from one trunk to 47,000 trunks via adventitious bud formation on a single root system. [citation needed]
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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 ...
The natural history of Cassida sphaerula in South Africa is a typical life cycle. [1] Several species of Cassida are important agricultural pests, [2] in particular C. vittata and C. nebulosa on sugar beet and spinach. The thistle tortoise beetle (Cassida rubiginosa) has been used as a biological control agent against Canada thistle.