Fungicide

 is a quest item in.

Quest

 * Can be given to the Giant Luminescent Spore, encountered as part of Annotated History and Root and Branch, for a peaceful outcome with the spore.
 * "Your captors wanted to use this on you, but I think you deserve better."

Uses

 * Can be converted into Fungal Fertilizer with Alchemy 17 (party assisted).
 * If the fungus present on the chemistry table is not picked up, the fungicide may be applied to it. Alternatively, you can pick them up and get 3x Huona Mahe.
 * The Watcher can return to the chemistry table later, if they want to convert the fungicide into a fertilizer instead.
 * Can be applied to the Spore Colony Mycelium, in the Central Stacks.
 * If not used on the Spore Colony, you can give it to the Giant Luminescent Spore encountered in the Quarantined Section.