A preliminary evaluation of the biological control formulation of Trichoderma harzianum marketed as BioTrek® was conducted on bareroot Douglasfir and western white pine seedlings at the USDA Forest Service Nursery, Coeur d'Alene, Idaho. The biocontrol material was applied topically on seed shortly after sowing and comparisons made between treated and untreated 1-0 and 2-0 seedlings. First-year Douglas-fir height and second-year white pine height and diameter were not affected by the treatment. BioTrek® significantly reduced white pine seedling root infection by Cylindrocarpon spp., but not by either Fusarium or Trichoderma spp. The major Fusarium species isolated from roots of nondiseased seedlings was F. oxysporum. Further tests of BioTrek® are underway at the nursery.
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