Cirsium vulgare Common name: spear thistle [Spear thistle]( adversely impacts agriculture by competing with pasture species, inhibiting stock movement, contaminating wool, and causing injury to animals. [Three biocontrol agents]( have been released in Australia: 1. Spear thistle crown weevil *Trichosirocalus horridus* 2. Spear thistle gall fly *Urophora stylata* 3. Spear thistle receptacle weevil *Rhinocyllus conicus* Further information is required on the establishment, spread and impact of these agents.