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CULT: Iris Borer

Hi Iris Friends
A little advice needed for the novice from those of you unfortunate enough to be experienced with this little devil, the iris borer.  I discovered, dug and disposed of 4 large trash bags full of infected rhizomes {groan} and now, before I put my precious newbies in the ground, would like to know what, if anything can/should be done to the soil to treat it, in case any of those foul foragers should still be lurking.  I understand the life cycle story of the borer, and that from here on out I should be looking for pupae and disposing (in the fall) of dead foliage.  But I'm wondering, in case any larvae remain, if there's anything I should be doing to keep them from my new (and salvaged) rhizomes, other than avoiding that part of the bed altogether. 
Thanks in advance, for your input. 
Mary Blatz
Skaneateles, NY (near Syracuse)  USDA Zone 5

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