The weevil "Larinus planus" also feeds on the thistle and has been used as a control agent in Canada. One larva of the species can consume up to 95% of seeds in a particular flower bud. However, use of this weevil has had a damaging effect on other thistle species as well, include some that are threatened. It may therefore not be a desirable control agent. It is unclear if the government continues to use this weevil to control Canada thistles or not.