1) Kills insects 2) Of or relating to insecticide 
Insecticidal is a 2005 horror movie featuring giant killer insects. A college student performs experiments on insects until a housemate tries to kill them. The insects grow to huge sizes and turn the sorority house into a nest, trying to kill the residents. ...
kills insects
Insecticidal: Capable of killing insects or controlling their growth.
insecticidal Capable of killing insects or controlling their growth.
adjective of or relating to insecticide