Investigations of containerized western white pine, western larch, and Douglas-fir seedlings at the Western Forest Systems Nursery in Lewiston, Idaho, revealed that many seedlings were colonized with Fusarium oxysporum although they lacked severe disease symptoms. White pine seedlings were also infected with Pythium spp., probably as a result of sowing infected seed. Styroblock containers in which seedlings were being grown were often colonized with F. oxysporum. Infected containers may be an important source of Fusarium inoculum and may provide the means by which these fungi are transmitted from one crop of seedlings to the next.
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