Natural History of the Southern Pine Beetle

Publication Type:Journal Article
:2011
Authors:F. P. Hain, Duehl, A. J., Gardner, M. J., Payne, T. L.
Journal:U S Forest Service General Technical Report SRS
Volume:140
Pagination:13-24
Date Published:2011
:Dendroctonus
:

The southern pine beetle (SPB) is a tree killer of southern yellow pines. All life stages----eggs, larvae, pupae, and adults[long dash]infest the inner bark or phloem tissue of the host tree. Adult beetles overcome the tree's defenses through a mass-attack phenomenon. They are attracted to the tree by a pheromone system consisting of volatiles produced by the beetles and the host. The pheromone system also prevents the beetles from over-colonizing the tree. Once inside the tree, parent adults construct serpentine egg galleries in the inner bark tissue. Individual eggs are deposited in egg niches along the egg gallery. After eclosion, the larvae develop on host tissue, and development is aided by mycangial fungi deposited in the egg galleries by the adult females. Pupation occurs in the outer bark, and brood adults emerge to attack another nearby tree. As this process continues infestation spots of dead and dying trees can be created. Generally an SPB spot gets its start on stressed and weakened tress. Depending upon climate, the number of SPB generations per year can vary from one to nine. The SPB has the capacity to cause periodic large-scale eniptions that encompass entire regions of the South. Host resistance, predators, parasites, diseases, and competitors all keep SPB populations in check during nonepidemic years.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith