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By:Type: ArticleIn: Arboreta and botanic gardens : a publication of the Los Angeles County Department of Arboreta and Botanic GardensVolume: 3Series:Issue: 1Date: 1991Page Range: 10Publication Info: Arcadia, CA, California Arboretum Foundation, 1989-Subjects: Aleyrodidae -- Control -- California Ash (Plants) -- Diseases and pests Encarsia