Iris Borer

Cynthia,
In regardd to your question: It is my understanding that Cygon, the mosty
commonly used chemical treatment for iris borer is a systemic poison.

 For those of you wrestling with the borer question I would refer you to
the archives to look at the review that was done a short while ago
regarding the use of nematodes on iris borer.

I am intrigued with the proposition that iris borer may be contained
geographically by temperature (or other) constraints. Let's continue to
collect and share our experience. Am I correct that we are not finding
borer outside of zones 4-7?
Ross
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