Arbuscular mycorrhizal (AM) fungi have been shown to play a key role in maintaining plant health. Community diversity of AM fungi, AM fungi/pathogen ratios, their dynamic balance in the soil, and their influence on plant physiology and metabolic process during the development of soil-borne diseases have become central topics in the field of mycorrhizas. The author started working on interactions between AM fungi and Fusarium oxysporum f.sp. niveum on growth and wilt disease of watermelon (Citrullus lanatus)...