rhizoctonia
noun
rhi·zoc·to·nia ˌrī-ˌzäk-ˈtō-nē-ə 
: any of a form genus (Rhizoctonia) of imperfect fungi that includes major plant pathogens
Example Sentences
Recent Examples on the Web When the microbes are in their proper proportions, pathogens such as rhizoctonia, pythium, fusarium, etc., function in a positive way. 
Howard Garrett, Dallas News, 23 Jan. 2020
Howard Garrett, Dallas News, 23 Jan. 2020 Word History
Etymology
New Latin, from rhiz- + Greek -ktonos killing, from kteinein to kill; akin to Sanskrit kṣaṇoti he wounds
First Known Use
1897, in the meaning defined above