Irradiate is a spell cast by the Science Vessel. It deals 250 damage over 30 seconds to any biological unit and splashes nearby units.
 Game Usage
 Terran vs Zerg
Irradiate is most effective against Zerg, as all their units are biological. Stacked Mutalisks are very vulnerable to the spell because it may be hard to select the affected unit and split it from the group. In the later stages of the game, Defilers and Ultralisks become priority targets for Irradiate.
 Terran vs Protoss
EMP Shockwave is the preferred spell to fight Protoss.
 Terran vs Terran
Since mechanical units are not affected by Irradiate, the spell is never used against other Terran players.