Viewing post #809295 by KentPfeiffer

Paul2032 said:I received an e-mail this morning from a friend who grows iris. She had been doing some spring clean-up in her iris and found some where the fan on the mother rhizome was yellowed but the increase were green. When she grasped the yellowed fan it pulled off easily and the remaining rhizome looked corky and tannish in color. The roots came up easily. The increase were well rooted. It seems like there was an article in one of the threads recently about different types of rot but I haven't been able to find it. Any help? I think I experienced this once a few years ago and cleaned out the old rhizome and drenched the remaining plant parts with Bayer Advanced 3 in 1 Formula and it corrected the problem. The increases continued to grow. Any one with practical experience with this?

Sounds like Botrytis, which was widespread in this area last year. I'm not convinced there is a treatment for it. Plants seem to either recover on their own or they die.

I had it throughout my beds last year, but only actually lost one named plant, 'Boy Genius'. It did cost me a lot of bloom, though, because the blooming sized rhizomes were heavily affected while small increases generally were not.