Spruce budworm defoliation causes continued top killing and tree mortality in northeastern Minnesota
By: [H.O. Batzer, J.L. Bean]
Contributors: Bean, J. L. (James L.), author; Lake States Forest Experiment Station (Saint Paul, Minn.)
Series: Technical notes -- no. 621; Technical notes (Lake States Forest Experiment Station (Saint Paul, Minn.) -- no. 621.
Published: 1962
Language: eng
Subjects: Choristoneura fumiferana; Picea; Mortality; Insect pests; Abies balsamea; Trees
Notes: "April 1962."

Includes bibliographical references.