Our arborist advice section is the most extensive expert collection of tree, lawn and landscape care tips and educational resources that you will find anywhere.
Follow our winter checklist to keep your trees and landscape healthy by identifying potential issues.
Coalition for Urban Ash Tree Conservation: Emerald Ash Borer Management Statement. Emerald ash borer has killed millions of ash trees since its discovery in 2002 and the number of dead ash is increasing rapidly. Ash species are abundant in planted and natural areas of urban forests, representing 10 - 40% of the canopy cover in many communities.
A fungus that discolors spruce needles and causes premature drop, especially in overly wet conditions.
Caterpillars feed on the leaves of oak trees and other species. Found on the Pacific coast.
Causes severe damage to forests and landscape pines, discoloring needles and eventually defoliation.