sentences:  Even though "R. bunodes" has only been found in tropic and sub-tropic environments, it is distributed worldwide with outbreaks occurring mainly in the Americas, Africa, India, Indonesia, the Philippines, and Sri Lanka.Considered an opportunistic root pathogen, "R. bunodes" typically infects plants that are already stressed from abiotic and/or biotic factors such as nematode or insect attack and poor soil nutrient levels/availability.Acidic and humid soils as well as those containing high levels of organic matter are frequently associated with occurrences of black root rot.