Dieing Buds

I was checking my irises and have found several that are dieing at the neck before the buds can open up.  I have found them on different TB's.  Can anyone tell me if I am doing something wrong.  I spray for insects and have looked very carefully at them to see if something is eating them.  I can't see anything.
Thanks,
Michael W. Norberry, Arcata, California  "Where the Redwood Trees grow"
m*@wcinet.net
 
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