Tree Campus K-12®

The Arbor Day Foundation’s Tree Campus K-12® inspires collaboration between schools, students, and communities to facilitate experiences with trees as a learning tool.

Slime Flux

Helpful information about “weeping water” from the trunk of a tree – usually a sign of a bacterial disease called Slime Flux or Bacterial Wetwood.

Pine Beetle – The Urban Problem

Awareness of the location of pine beetle infestations near them and research based information relative to the management options available is the best defense a homeowner can have.

Hypoxolon Canker in Urban Trees

Found in the outer bark areas of living and healthy trees, Hypoxylon are normally of little consequence. However, the fungi can severely injure or kill trees that have been weakened by factors such as drought, root disease, mechanical injury, logging or construction activities. T

Gummosis in Trees

Gummosis is a common infection found on various fruit and nut trees. In the landscape, gummosis is most often recognized as a glob of translucent, amber colored sap on the side of the stem or lower trunk of trunk of a tree.

Fungal Conks on Trees

Fungal Conks, or mushrooms growing from the trunk or base of a tree, are an indication that a rotinducing pathogen has taken up residence. Some of these fungi are significantly less harmful than others, but all warrant further investigation.

Diseases of Leyland Cypress in the Landscape

Leyland cypress has become one of the most widely used plants in commercial and residential landscapes, and it is relatively pest-free. However, because of its relatively shallow root system, and because they are often planted too close together and in poorly drained soils, Leyland cypress is prone to root rot and several damaging canker diseases, especially during periods of prolonged drought.