Larval development and adult emergence, population levels, oviposition and parasitism ofSciopithes obscurusHorn were determined in western Oregon. Five larval instars developed in 239 days. At 20°C, adults began emerging 288 days after 1st instars were placed on roots of container-grown strawberry. Larvae were collected from mid-June to August. Adult emergence occurred during July. Highest numbers of adults were observed on rhododendron between August and October. Between May and November, the percentage of field-collected adults containing mature oocytes ranged from 20 to 81% with the lowest percentages occurring in July and November. Larvae of a flyDolichotarsus(sp. unknown) (Diptera: Tachinidae) parasitized 32% of adult weevils in one rhododendron garden.