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mycoherbicide

n. Any bioherbicide based on a fungus.

Wikipedia
Mycoherbicide

A mycoherbicide is a herbicide based on a fungus. As a biological agent, these `mycoherbicides . . . work by producing toxic compounds that dissolve the cell walls of targeted plants. Unlike traditional herbicides, mycoherbicides can reproduce themselves and linger in the soil for many years to destroy replanted crops.