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Home → Publications → Seed and Seedling Diseases in the Western US → Diseases Associated with Containerized Seedling Soil Mixes

Diseases Associated with Containerized Seedling Soil Mixes

Although most peat-vermiculite mixes are relatively pathogen free, disease organisms can be introduced into containers on seed and plant debris or in irrigation water. Major root pathogens of containerized conifers include species of Fusarium, Pythium, and Phytophthora. Fusarium spp. are the most common and produce several different signs of disease, including stunting, chlorosis, and needle tip dieback, and well as killing some seedlings. Composted tree bark included in the medium will suppress many pathogenic fungi.


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Author(s): USDA Forest Service