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Phytophthora Root Rot

Phytophthora Root Rot
This fungus disease causes root rot and stem cankers on many landscape trees and shrubs. Phytophthora is most prevalent in clay soils that are poorly drained, and on sites receiving excessive irrigation. Fungicide treatments are available to suppress this disease. Careful selection of plant species for sites prone to root rot and judicious irrigation are also keys to managing the disease.