in that borers are related to foliage. Borers lay eggs on the leaves, that then hatch and crawl down the inside of the leaves and down into the rhizomes. To get rid of the eggs is why many people cut back the foliage in the fall. I want my iris to grow as much as possible during the summer & fall so I keep my leaves until October or so, then cut them back. It gets really wet here in late fall so if I don't have a clean garden then the rhizomes are open to rot.
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