I had a mad clean out of my cupboard (vacuumed and wiped) when I found I had flour mites in the cupboard - I now insist that everything goes into airtight glass containers....I hadn't thought about the lasagne sheets though (we get through those fairly quickly)!
Generic bug spray will kill the little bastards once you have cleaned and stop them coming back for a loooong time.
Dust is their friend, as are spilled packets. Don't buy elderly food from the corner shop which may have sat there a while - supermarkets have fast turnaround which reduces the risks of infested food coming to you.
Clip top tubs are the thing though, they can't live without oxygen!