Title: Distribution of Oligonychus (Oligonychus) ununguis (Jacobi) (Acari: Tetranychidae) and predator mite species (Acair: Phytoseiidae) on field-grown Douglas-fir (Pseudotsuga menziesii [Mirb] Franco) Christmas trees
Subjects: Christmas trees, Spider mites, Phytoseiidae, Diseases and pests
Places: Willamette River Valley, Oregon