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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]
This type of weed resembles a dandelion more than a thistle. If not mowed, a sow thistle will produce a bright yellow, dandelion-like flower on plants that can grow two to three feet tall, Feldman ...
Aceria anthocoptes is considered to be a good potential biological control agent for Cirsium arvense, the Canada thistle. It damages both the epidermal cells and deeper mesophyll layers, on both the upper and lower surfaces of this invasive weed. The result is visible deformation and folding of the leaf blade, with a curling of the leaf edges.
Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) is a selective herbicide used for control of broadleaf weeds, especially thistles and clovers. Clopyralid is in the picolinic acid family of herbicides, which also includes aminopyralid, picloram, triclopyr, and several less common herbicides.
"Weed control is all about competition as a healthy and properly cared for lawn will make it much harder for these pesky weeds to take hold," he says. Mowing The type of turf provides guidance on ...
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. [8] [9]
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