The sweet clover weevil, bitona cylindricollis Fahr. is one of the principal insect pests attacking sweet clover in South Dakota. While the pest works on sweet clover principally, it has also been found feeding on other clovers and on alfalfa, although only in small numbers. The sweet clover weevil is a European insect which was first reported to have been taken on this continent near Montreal, Canada, in 1924. In 1941 it was found in South Dakota in small numbers but at the present time it occurs abundantly over the entire state.
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South Dakota State College
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Severin, H.C., "The Sweet Clover Weevil in South Dakota and Recommendations for its Control" (1951). Agricultural Experiment Station Entomology Pamphlets (1940-1952). 16.