Janos, Look up "iris borer". It's a fairly common pest encountered by people who grow iris. I'm surprised Adam hasn't seen it. I lived in his part of the country most of my life and encountered the grubs tunneling through leaf and rhizome. On Jun 10, 2009, at 12:27 PM, Adam Fikso wrote: > Hello Janos- I've grown irises for more than 35 years (but in the > U.S.) and > have never seen the insect you describe, nor the kind of damage you > show in > your photo. It may be something new to your area or peculiar to > that one > shipment. I think you are wise to burn the affected leaves. Carlo A. Balistrieri, Executive Director The Gardens at Turtle Point Tuxedo Park, NY 845.351.2849 Zone 6 visit: http://www.botanicalgardening.com/ and its BGBlog coming soon: Carlo Balistrieri Photography