What is the minimum amount of inoculum needed to form mycorrhizae?
Mycorrhizae can form from only one spore that germinates and infects a root, but it may take a long time for the fungus to spread to a significant portion of the root system. Therefore, it is better to initiate multiple infection sites to speed up the colonization process. The minimum needed depends on the size and age of the root system. In other words, there is no specific answer to the question.
