The local Iris Society has a page on this. Check it out!
http://www.dvis-ais.org/home.h...
Click the link above. Scroll done to "Iris Culture". There you will see articles on Rot, Fungus, and Borers. Click the appropriate article and enjoy! I use the systemic Bayer granduales and have very little borer issues. I still have them in very small quantities, so it has not been much of an issue lately. If you are against chemicals and/or have a small number of irises you may want to go with the "squish" method.
