Andrea-
Holy Bleep is right! Years ago I had bought some in the powder form at very modest cost.........maybe $10-15. In the meantime I've been using Daconil & Sulfur alternatively with fair success. Also the EPA has drastically restricted what can and cannot be sold to residential households! Like Arlyn said the fungal pathogens almost cure themselves if given adequate hygiene and removal of all dead foliage. And you are wise to thin out very large clumps; that helps with airflow & sunlight.

These are the products that I use for fungal problems (along with good housekeeping).

Thank you very much, Leon, it's good to know I can control the problem using Daconil and sulfur.

I might add that any fungal problems are much easier to "prevent", than they are to "cure", so, try to get the beds "ship shape" before the wet, warm conditions start, and make "prophylactic " sprays of fungicide. I use 4 different fungicides ,alternating them, and make applications about every 10 day-2 weeks, starting when new growth starts on the plants....but, that might be "over kill" for your climate conditions . Another thing I do...usually....is to add "half strength" Miracle Grow to the fungicide "spray application" that is made about 2-3 weeks after bloom has ended....the iris foliage is at it's "rattiest" then, and the plants are beginning to come out of their resting period....what this seems to do, is cause them to have a "growth spurt", and push off a lot of leaves, over a real , short period of time....which makes for a huge "clean-up", but, it gets the plants "looking good" pretty quickly. It's something I learned from a couple commercial grower's sites, and, it does work, but....my "collection" has grown to the point that, it's a BIG job !! This year, I only did it in the rebloomer beds, as besides "more iris", there is also "less energy and time"

Thank you, Arlyn, for your excellent advice. Until now, I have never had a rot or fungus problem, so I've been very spoiled. I'll have to do a lot more preventive care now.

I am seeing some leaves falling over at the crown but not the white stuff or mustard seeds. I will get busy spraying with Daconil and have heard about the addition of Miracle Gro to that mix after bloom season. I will get my sprayer out!!! After the wet spring with alternate hot then freezing temps, anything can happen!!! Now back to the heat and no rain to speak of. Ugh!

One quick test for 'type of rot", is to "smell" it ! Fungal rots generally have a "beer", or "bread" smell....sort of "yeasty". Bacterial soft rot smalls 'bad'...like a rotten potato. Just guessing, but I would say you (with the wet weather, and warmer temps) are seeing bacterial soft rot.

If so, the "treatments" will be a bit different.....fungicides (like daconil) won't work on bacteria (but will help with any fungal leaf spot that might be present), so , scraping out the "soft spots", and dusting with *Comet cleanser, or, spraying with a 10% bleach solution, might be a better option. As with any disease, the more sun, and air, you can get to the base of the plant, the better it will "like" you ! Remove any weeds, spent leaves, spent stalks, as soon as you can.