Leaf Borer

I've received so many conflicting pieces of advice about borer control, I
hoped those on this dedicated list could provide a legitimate definitive
response...
     Two years ago, when my irises were badly affected by borer, I posted
a note on compuserve's gardening forum asking for suggestions...malathion
was suggested...of course, this kills just about everything, beneficial
and malevolent...the next year, I again posted a note, and Cygon was
recommended...obviously, this too is not a natural disease controlling
agent, but on the other hand, I would like to be sure I don't again
suffer the heartbreak of borer...
     Could some of you "out there in cyberland" please post some
suggestions as to how you've controlled borer (other than just clearing
out the debris from the ground each year)...the more specific, the
better, i.e. when exactly to do what, how often, etc.  Many thanks! 
Peter Goodfield in N.C.
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