This document discusses three methods to control fungus: 1) Using fungicides like sulphur, lime, mercury, selenium, and copper compounds to chemically kill fungi. Fabrics can be treated with fungicides to prevent rot. 2) Breeding plants that are resistant to certain fungi like wheat that is resistant to rust. 3) Altering environmental conditions like moisture levels to make conditions unfavorable for fungal growth by keeping areas dry. The document also notes that overuse of antibiotics can lead to fungal infections because antibiotics kill bacteria in the body that normally keep fungi in check, and that fungi produce antibiotics to protect themselves from bacteria.