Defoliation of Sitka spruce by the green spruce aphis
By: A. D. Hopkins
Contributors: United States. Bureau of Entomology; United States. Bureau of Entomology and Plant Quarantine
Series: Forest entomology brief -- 43; Forest entomology brief -- 43.
Publisher: U.S. Department of Agriculture, Bureau of Entomology
Published: 1918
Place of publication: Washington, D.C
Language: eng
Subjects: Control; Spruce aphid; Sitka spruce; Diseases and pests
Notes: "December 4, 1918."

"E-169"