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Girdling roots, which grow around another root or trunk, create pressure and “choke” or compress water and nutrient conductive tissues.
Foamy bark canker disease is the newest discovered threat to coast live oak in California. The disease is vectored by the native western oak bark beetle and has been found in multiple counties in Southern California. It threatens to destroy southern California's coast live oak trees.
Fire blight is a leaf disease that attacks a variety of fruit trees and rosaceous ornamental trees.
Common throughout the U.S. and Canada, these caterpillars feed on over 100 species of forest, fruit and shade trees. Some of the favored hosts include wild cherry, pecan, black walnut, persimmon, mulberry and sweetgum.
The tender leaves of a wide variety of tree species are food for these leaf-chewing caterpillars, with elm, oak, and apple being favorites.
European Crane Fly
A swift decline in tree health, as exhibited by crown dieback, leaf discoloration and leaf drop might indicate the presence of the eucalyptus longhorn borer.
The larvae and adults of the elm leaf beetle can completely defoliate elms when populations are large.
The eastern tent caterpillar is a pest native to the United States, favoring wild cherry, apple and crabapple trees. The pest is a most serious threat when attacking black cherry trees.