Abstract
In Washington, California, and Oregon, 15 endemic species of insects were reared to maturity on tansy ragwort ( Senecio jacobacea L.), an undesirable plant introduced from Europe. Arranged by families, these insects are: Thripidae— Frankliniella minuta Moulton, F. occidentalis (Pergande), and Thrips tabaci Lindeman; Cercopidae— Philaenus leucophthalmus (L.) ; Aphididae— Anuraphis cardui (L.), A. helichrysi (Kaltenbach), and Aphis lugentis Williams; Geometridae— Eupithecia coagulata Guenee, E. bivittata Hulst, and E. miserulata zela Swett and Cassino; Tortricidae— Argyrotaenia citrana (Fernald) ; Pterophoridae— Platyptilia williamsii Grinnell; Phycitidae— Homoeosoma sp. prob. electellum (Hulst); Agromyzidae— Phytomyza atricornis Meigen; Tephritidae— Paroxyna genalis (Thomson). These insects appear to range from oligophagous to polyphagous. Many are of minor importance and some are rare. Around Fort Bragg, Calif., only 4 were sufficiently numerous to permit a meaningful evaluation of their feeding damage. The 3 Eupithecia species destroyed 3.3% and 4.5% of total seed production in 1961 and 1962, respectively. Larvae of Paroxyna genalis destroyed 1.5% and 1.3% of the total seed crop.
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