Kotinsky, J. 1921 Insects injurious to deciduous shade trees and their control.. Farmer's Bulletin (United States Department of Agriculture) 1169: 1-100.
Notes: Cottony maple scale and European elm scale among those reviewed.
Kotinsky, J. 1921 Insects injurious to deciduous shade trees and their control.. Farmer's Bulletin (United States Department of Agriculture) 1169: 1-100.
Notes: Cottony maple scale and European elm scale among those reviewed.