Pitch tubes glossary and government resources

Pitch tubes : a tubular mass of resin that forms on the surface of bark atbark-beetle entrance holes.

Washington State Department of Natural Resources:
Trees with large number of pitch tubes above six feet high on the bole,

Experimental Design
...to locate all trees either containing pitch tubes or with visible crown

5.4 PLANT COMPOUNDS AND RESIN IN RESISTANCE MECHANISMS
...to the amount of resin exudation and formation of pitch tubes (Webb, 1906).

Yellowstone Digital Slide File
01723.jpg Bark Beetle pitch tubes on lodgepole pine; Myers; No date.

Jeffrey Pine Beetle FIDL 11
Large, reddish pitch tubes (fig. 3) can be found projecting from the bark on

FID Photo Gallery
...adults, pitch tubes 1, pitch tubes 2. Adults PT Flanagan, Pitch tubes PT Flanagan,

Insects
Beetles bore directly through the tree bark, producing pitch tubes resembling

Tree Disease and Insect Guide
Evidence: pitch tubes, galleries, fading crowns, fallen frass, fallen green

Forest Health Monitoring Review: Spring 2003
Bark Beetles, Pitch tubes; fading crowns, Check brood health; report significant

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