cyanicide
/ˌsaiəˈnɪsɪd/Definitions
1. noun
A substance or agent that kills cyanobacteria.
“The researcher studied the effects of various cyanicides on the algal blooms in the lake.”
2. noun
A substance that destroys or inhibits the growth of cyanobacteria.
“The new cyanicide has been shown to be effective in reducing cyanotoxin production in water systems.”