Leaf Strip

Controlling the Iris Borer

Macronocture onusta, the iris borer, can pose serious and frustrating problems for the iris grower in the eastern United States. They will attack all kinds of irises. What gardeners call the "iris borer" is actually the larval form of a moth, a wonder of iris destruction. The larvae have been found to be cannibals who eat their rivals. They also can spin a tiny web and use it to hang-glide off to irises some distance from where they hatched. Oddly enough, the iris borer was first discovered in the 1890's in the northern suburbs of Chicago on some daylilies! Iris borers with a rhizome showing borer damage. Iris borers with an iris rhizome. The darker curved area on the rhizome is damage caused by an iris borer.

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