Images
Above ground symptoms of a tree infected with Phythophthora. Above ground symptoms of a tree infected with Phythophthora. The lower (rootstock) portion of the tree has been infected with Phytophthora.

 
Browning of crown tissue.
Browning of crown tissue.		 Characteristic browning of crown tissue when a Phytophthora infection has occurred.
Roots infected with Phytophthora. Roots and Rootstock infected with Phytophthora. Root rots of this sort can be determined by the discoloration of vascular tissue and the cortical root tissue can

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Websites
utah pests homepage Integrated Pest Management Plant Diseases Insects and Their Relatives Utah Plant Pest Diagnostic Lab