Nodding thistle is attacked by a weevil, Rhinocyllus conicus introduced to Saskatchewan in 1968. Weevils may be gathered by collecting about 500 infected nodding thistle seed heads in mid-August, and ...

A weevil that is smaller than a sunflower seed and causes enormous damage is botanist Charles Clarke's nemesis. The tiny orchid weevil, Orchidophilus aterrimus, has threatened to ruin the renowned ...