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I am trying to figure out what is causing this damage/burn on my irises. I just rec'd my first named Iris this year, Before the Storm, and would like to see it bloom once before it's lost to something beyond my control!!
I've attached some pictures. My initial reaction is Voles. I'm looking for help to identify the problem, resolve it and prevent it in the future. Thanks so much.
Even with good fall clean-up last year, some of my BB iris clumps had a lot of these little brown streaks... I was afraid it might be a sign of borers but was reassured on that count by Don Spooner... I saw similar markings on an iris (just one plant, out of thousands! LOL) in his garden and asked him about it... he said there's a fungal disease that is spread by (I think?) aphids, and indeed it's much more likely to pop up after a wet spring like we had.
Hey, Paul... wanted to mention... our local iris society has its rhizome sales Saturday July 14 (at Watson's Garden Center in Lutherville MD) and Saturday Aug. 21 (at Dutch Plant Farm in Frederick) this year. I wrote an article about the 2008 sale here, just to give you the flavor of the event: http://davesgarden.com/guides/articles/view/1497/
Don didn't seem to think there was a lot to be done about it, or that it was much of a concern (other than being unsightly). If you see aphids, a squirt from the hose to knock them off the leaves or a spray of insecticidal soap should take care of them and limit the spread of the fungal infection.
The MAG spring swap was such fun, we're looking for additional excuses to get together this summer... I'm sure we'll "do" lunch or some such after the iris sale... drop by the MAG forum and see what's up!
Are you seeing more of this? What I am noticing from your pics is the brown leaves coming from the middle of the fan, and not just the outer leaves. Is this true? This may be a symptom of scorch, which I am becoming more informed about this year.