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Home → Publications → Seed and Seedling Diseases in the Western US → Effects of Fertilizer on Selected Potential Plant Pathogens in Bareroot Forest Nurseries

Effects of Fertilizer on Selected Potential Plant Pathogens in Bareroot Forest Nurseries

Soil-borne microorganisms, including potential plant pathogens, respond to fertilizers and organic amendments. High levels of nitrogen usually result in increases of Fusarium populations and more severe disease; organic nitrogen sources encourage disease more than inorganic sources. Balanced nutrition of nitrogen, phosphorus, and potassium helps reduce Fusarium diseases. Reducing soil pH and avoiding excessive fertilization may help control Phytophthora diseases. Growers need to monitor disease and formulate fertilizer regimes that do not initiate or aggravate existing disease problems.


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Author(s): USDA Forest Service