Certain strains of "Rhizopus microsporus" use agricultural rice as a host, causing the disease Rice Seedling Blight. This infection is first observed by the fast swelling of seedling roots, but displays no further signs of infection. The main causal agent of Rice Seedling Blight is attributed to the endosymbiotic relationship with "Burkholderia" sp. The production of rhizoxin by the bacteria inhibits the ability of rice plant cells to perform mitosis, dramatically weakening or outright killing young rice seedlings. The killing of the plant cells is beneficial to both the bacteria and the fungal host, as the two live as necrotrophic pathogens.