Irritation weapons?

[Lord_Shleepy]

I've been pondering this for some time now (ok...since early this afternoon) and the lively discussion on the benefits/drawbacks of mosquitos in the "Nukes" thread brought it to mind again.

Would it be possible to design a weapon that could be used to annoy a planet's population, as opposed to exterminating it? Perhaps something that would act like a plague bomb but instead of slowly killing the population over time it would slowly make the population angrier over time. Something that would release swarms of biting insects into the environment or a plague of rampant hair loss or acne. Could this even be tied into population migration - increasing migration rates away from the inhospitable world?

Of course, I have no idea what I am talking about. I've barely had time to sink my tooths into the SEV demo let alone the full version (which I can't afford anyway...sniff sniff). Please feel free to educate me if necessary.