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
By: by James D. Calkin.
Published: 1991
Language: eng
Number of pages: 56
Subjects: Christmas trees -- Diseases and pests -- Oregon -- Willamette River Valley.; Spider mites.; Phytoseiidae.
Notes: Typescript (photocopy)

Thesis (M.S.)--Oregon State University, 1991.

Includes bibliographical references (leaves 49-56)