These resources are brought to you by the Cooperative Extension System and your Local Institution
eXtension is an interactive learning environment delivering the best, most researched knowledge from the smartest land-grant university minds across America.
eXtension: more mind reachHave a question? Try asking one of our Experts
Last Updated: April 04, 2011
Fading of the needle color is the primary early symptom of colonization by bark beetles. The needles fade from dark green to pale green to straw yellow to a rusty red. The progression from green to red will take several months. Within 12 months, the needles will have fallen off the tree. Within the next few years, the bark will begin to fall off the trunk.
Jeff Schalau, Associate Agent, University of Arizona, and Tom DeGomez, Area Agent and Regional Specialist, University of Arizona
Unlike most other resources on the web, we have experts from Universities around the country ready to answer your questions.
This resource area was created by the: Climate, Forests and Woodlands community
Other Resources:
