Black check in western hemlock
By: by H.E. Burke
Contributors: United States. Bureau of Entomology; United States. Dept. of Agriculture
Series: Circular / U. S. Dept. of Agriculture. Bureau of Entomology -- no. 61; Circular (United States. Bureau of Entomology) -- no. 61.
Publisher: U.S. Dept. of Agriculture, Bureau of Entomology
Published: 1905
Place of publication: Washington, D.C
Language: eng
Number of pages: 10
Subjects: Cheilosia; Wood borers; Western hemlock; Diseases and pests
Notes: Circular No. 61.

"May 24, 1905."

At head of title:  U.S. Department of Agriculture, Bureau of Entomology.

Also available on the World Wide Web.
Table of contents: title: Economic importance. pp. 1.; title: Historical. pp. 2.; title: Life history and habits of the hemlock bark maggot. pp. 4.; title: Description of the stages. pp. 5.; title: Habits of the larva. pp. 6.; title: Natural enemies. pp. 7.; title: Associates; title: Methods of preventing losses; title: Bark maggots in other trees; title: The lowland fir bark maggot. pp. 8.; title: The alpine fir bark maggot; title: The Sitka spruce bark maggot; title: The Yellow pine fir bark maggot; title: Conclusions. pp. 9.