INFECTION DEVELOPMENT AND INTERACTIONS BETWEEN VESICULAR‐ARBUSCULAR MYCORRHIZAL FUNGI

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Abstract
Summary: The response of mycorrhizal infection to changes in inoculum density was similar in form forGlomus tenuisandGlomus monosporus. Nevertheless,G. tenuisproduced considerably more infection per propagule unit than did G.monosporus, probably due to a greater ability ofG. tennisto produce secondary infection points. When mixed inocula of the two fungi were used, both the time of harvest and the frequency of each fungus in the inoculum influenced the competitive effects.Glomus tenuiswas slow to form infection points, and was less aggressive thanG. monosporusat 12‐ and 24‐day harvests. By 36 days the two fungi were equally aggressive and the amount of infection produced by each fungus was directly proportional to its frequency in the inoculum.