[quote=thewizardguy]
The zerg can't manipulate mental energy due to the fact that it isn't genetic. Mental energy can only be manipulated through high training and knowledge, instead of genetic adaptation, which is why Zerg units aren't psychic. The Protoss are the only beings with the discipline and knowledge to master this, although the Terrans are starting to catch onto it.
[/quote]

actually, every zerg unit is connected to the hive via a psionic network, allowing them to do things with psionics. they just adapted an organ that constantly sent out a psionic emp, dispelling psionic and mental energies