By Mary Small, Colorado State University Cooperative Extension Urban Integrated Pest Management
If your pine trees are showing yellow and brown needles, this does not necessarily mean they have a disease. Interior pine needles of a certain age turn yellow or brown in the fall, then drop. This is normal. As long as this year's needles are green and the buds are healthy, the trees will continue to grow. Pines retain their needles for different lengths of time before they shed them. Ponderosa pines, for example, shed their three-year-old needles. If, however, needles around the branch tips are yellowing or browning, contact the Colorado State University Cooperative Extension office in your county to ask for help with the problem.
Photograph courtesy of Judy Sedbrook.
© CSU/Denver County Extension Master Gardener 2010
888 E. Iliff Avenue, Denver, CO 80210
Date last revised: 01/05/2010