Abstract
The biological control of Fusarium root rot of Douglas-fir seedlings by Laccaria bicolor was studied in vitro. Primary roots of Douglas-fir seedlings were exposed to L. bicolor for 1 wk and then inoculated with Fusarium oxysporum. Resistance sufficient to prevent lethal infection was expressed to a nonagressive strain of F. oxysporum at 17 but not at 22 C. Resistance was not expressed against two aggressive strains of F. oxysporum at either temperature. The pathogen entered all inoculated roots but was restricted to cortical intercellular spaces in which effective resistance had been induced (...)
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