| Popis: |
Laminated-root rot, caused by Phellinus weirii (Murr.) Gilb., is a serious disease affecting Douglas-fir and other commercially important species of conifers in northwestern North America. Recent work has shown that this fungus is successfully reduced or eliminated by the fumigant chloropicrin. However, the effect of this biocide on nontarget organisms, including ectomycorrhizae, is uncertain. Following an initial assessment of organisms 2 years after application of the fumigant, a reassessment of the establishment of ectomycorrhizae on Douglas-fir seedlings was undertaken 4.5 and 5.5 years following chloropicrin application. Our findings show that in areas around stumps treated with 20% and 100% of the labeled dosage and in areas around non-treated stumps, chloropicrin did not adversely affect the formation of ectomycorrhizae on young Douglas-fir seedlings by naturally occurring fungi. No significant effect on the abundance or type of mycorrhizae were detected. On this site, chloropicrin did not affect these mycorrhizal associations, at least for 5 years following application. |
Full Text from ScienceDirect