Biological control of creeping thistle (Cirsium arvense): Analysis of the releases ofAltica carduorum [Col.: Chrysomelidae] in Canada

Altica carduorum Guérin-Méneville, a biological control agent against creeping thistle (Cirsium arvense (L.)Scop.) was released in Canada on 2 climatically contrasting release sites. Predation at the southern site, aggravated by slow egg and larval development, and low temperatures at the northern site prevented establishment. Reports from other releases in… CONTINUE READING