Tree diseases

Pear Trellis Rust (PTR) was introduced into the United States from Europe in the 1990’s and has been progressiv…

All species of pines are attacked by insects known as bark- and wood-boring beetles. As a group, these insects are hi…

Many Phytophthora species attack shade trees and landscape ornamentals causing root and root collar disease,…

Phytophthora root disease is a widespread but often overlooked disease of landscape plants. There are many s…

Phytophthora root disease is a widespread but often overlooked disease of landscape plants. The name, Ph…

The pinewood nematode (Bursaphelenchus xylophilus) is the most destructive pest of forest and landscape pine…

For several years, arborists and homeowners throughout California have observed symptoms of general decline in hedges…