Mycorrhiza – symbiotic associations between plant roots and fungi – play a major role in many fundamental plant functions such as mineral nutrition or stress resistance. As the link between plants and the soil, mycorrhiza are now of great interest for developing new strategies in sustainable agriculture. Since they allow a decreased use of fertilizer and pesticides, negative impacts on the environment can be minimized. With contributions from renowned international scientists, this manual offers a great variety of practical protocols for analyzing mycorrhiza, including the latest molecular, biochemical, genetical, and physiological techniques.