Starcraft 2 Zerg training series: Corruption

Always remember to use corruption

Overseers have corruption, when scouting your enemy, use Corruption on important/tech structures as you pass over. If
you are there anyway, there is no reason not to drop Corruption and spend some Overseer energy.

Use it on upgrade centers especially. Delaying upgrades at the Engineering Bay, Armory, or Forge is a great use of Corruptor energy.

Just using it once or twice in this capacity could mean that the next time you engage your opponent's army they will have 1 less upgrade point than they would if you had not delayed their research, not to mention if you plan on rushing early game you can delay your enemies miner or army production.

Also use corruption when you've hit a base hard, taking out its defences, to stop further production while you prepare some more armies.