CULT: help - aphid predators?

From: linda Mann <lmann@mailhub.icx.net>

Probably the worst possible time of year to get answers on this one, but
the remaining greenery on irises here are getting mangled by aphids. 
Between cold and juice suckers, the foliage is badly infested with
spot/rot whatever crud.  There are swarms of ladybugs here in warmer
weather, but are there any predators around this late in the season?  

I've been squishing the aphids by swiping the leaf blades between my
fingers (stains my fingers red!- aphid blood), but would like to know
more about aphid life-history and winter predators.  Will wintering
sparrows feed on them?  Any good websites to learn about bug biology? 
Bill or others have time to give a brief list lecture?

Thanks in advance.

Linda Mann east Tennessee USA

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