Economic injury level of the pear psylla, Psylla pyricola Forster, and a discrete time model of a pear psylla-predator interaction.
Published: 1975
Language: eng
Number of pages: 94
Subjects: Pear -- Diseases and pests
Notes: Thesis (Ph. D.)--Washington State University.

References cited: leaves 89-94.

WSU:"Dept. of Entomology"

WSU:Another copy on microfilm, no. 1760.