In vitro growth tests with glyphosate (RoundupR), hexazinone (liquid Velpar L.R and granular Pronone™5GR) and trichlopyr (GarlonR) on five species of ectomycorrhizal fungi (Hebcloma crustuliniforme, Laccaria laccata, Thelophora amcrieana, T. terrestris and Suillus tomentosus) showed varied species sensitivity to different concentrations of herbicides. Fungal growth was significantly (P = 0.05) redueed particularly at concentrations above 10 ppm. Garlon with trieolopyr as a. i. was the most toxic of the four herbieide formulations.
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Chakravarty et al. (1987) studied this question.
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