The plum curculio, Contrachelus nenuphar (Hbst.), always a serious pest of stone fruits in thc Niagara Peninsula, Ontario, has increased in importance since 1946, especially in peach orchards. A five-year study of its life-history, ecology, and control was started in 1950 at Vineland Station. This paper deals with the biological phases of the investigation.
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Thomas R. Armstrong (1958) studied this question.