In view of the general absence of ectotrophic mycorrhizal fungi for radiata pine (Pinus radiataD.Don) from grassland soils, but their frequent occurrence in eucalypt soils, effects of non-host plants on mycorrhizal fungi were studied. In glasshouse experiments, grasses grown in association with pines depressed mycorrhiza infection, probably due to grasses lowering the nutrient status of the soils. #x2018;After harvesting of grass tops and replanting withPinus radiata, decomposing grass roots decreased mycorrhiza formation. The data suggest production of toxins to mycorrhizal fungi from decomposing grass roots.#x2019;
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