禍害 is read as かがい (kagai) and means evil.
かがい
kagai
かこん
root of an evil
まがごと
misfortune
わざわいのふ
sink of iniquity
かこんをのこす
to create a breeding ground for future problems
まがつひのかみ
evil gods (who cause sin, etc.)
かふくとくそう
calamity, good fortune, success and failure
かいん
cause of trouble
しょうがい
steeplechase
さいがい
calamity
injury
はくがい
persecution
ぼうがい
obstruction