-Mycorrhizal fungi are present in almost all soils.
-Intensive management practices limit-viability and infectivity of native mycorrhizal fungi.
-Excessive applications of chemical fertilizers and pesticides.
-Metabolized by soil microbes.
-Severe soil disturbances like erosion, tillage,compaction.
-Often absent in sterilized or soil-less potting media.
-Non-native transplants grown in soil and climactic conditions different from the areas where they are planted.
-Plants established in areas prone to environmental stresses.
jim items answered the question on January 29, 2019 at 16:19
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