I've never used it, but have read about it and most of the results were not satisfactory. To quote one scientist, Dr. Jeff Gillman: " Hydrogen Peroxide is a relatively unstable material that breaks down quickly and is unlikely to last more then a few hours on a plant even under the best of conditions." Since it would harm the plant to continually apply HP to it's leaves hour after hour, the microrganisims that infect the plant will have ample time to reestablish themselves once the initial application of HP wears off..........Hope that information helps you decide what you would like to do......Maryl

Maryl, Thanks, I'll skip it for the moment. Do you know anything about Baking Soda and
water spray?
Fred

What leaf disease do you have? Can you upload a picture?

I've been spraying a peace lily that has some thing. The leaves especially the tips turn a dingy dark olive green and go limp, eventually the whole leave goes that way.

Here he is. note the white stuff is the baking soda residue.

It's only the older leaves right?

From my first impression, it looks like it's being over watered (or underwatered) and isn't getting enough light.

What kind of light does it get and how often do you water? Do you do it on a schedule or ask the plant fitst?

It appears that the roots are rotted from over watering and the plant is using its older leaves to sustain itself and Keep itself alive. I would take the plant out of the pot and see what the roots look like. Are they brown/bblack or mushy? What about the crown of the plant? you can pretty safely cut away all the rotted areas and try to repot it cutting away all but a couple leaves on each "stem" (or crown). I recommend 1/3 compost, 1/3 perlite and 1/3 coco coir and once you water, wait for the plant to yell you its ready for more water, then soak the root ball in water but let all the excess drain out of the bottom, don't leave it with soggy soil. This is all assuming the crown hasn't rotted. If you find rotted crowns, throw them away (or compost them) and only plant the ones that are still firm.

No it effects some new leaves also, I've been trimming off the badly effected leaves. I recently (say 10 days ago) repotted the plant. I took a small division and potted it separately.
I moved the larger plant outside into a shady area. It got rained on and the leaf blight got
worse. I understand your concern about watering habits. I believe that I have been careful.
This plant was a "rescue rack" plant last fall. At the time I thought it was only BBS neglect.
Now I am of the opion that it is a virus or bacterial infection, which is why I was using the baking soda spray. The small division is inside and so far shows no sign of the blight.
To answer your question: the roots were OK, as a mater of fact it was hard to divide the little guy from the main clump. No crown rot.

Hm. Do you use tap water? Is it municipal water or well water? Do you fertilize?

The leaves just looked kind of droopy like it's been overwatered. I hope you can get a hold of the problem and if not that the division turns into a beautiful plant...tthat may take a while though lol.

well water that I leave sit out for 24 hours to get up to room temperature

I tried the baking soda spray yet again, nothing to loose. I'll take a picture of it
today.

Gee, I'd been off this forum for awhile when I saw this post running on. I had the exact same thing happen to my Peace Lily. I figured it was watering (over/under/ wrong time of year whatever) that was causing it. Or maybe it was fertilizer burn after repotting ( I repotted mine a couple of times myself). I know. Fat lot of help I am. Anyway I was pretty sure it wasn't any sort of fungus, but never did figure out what it was. I had 3 or 4 Peace Lilies over many years and all of them eventually got this blight. I just cut off the leaves and moved on. Now I have some sort of Parlor Palm in the place I had the Peace Lilies and it has been longer lived then any of them..........Maryl

Maryl, you were never able to get this under control and have now stopped growing peace lilies? Well if I can't stop it the plant will stay outside and winter will be the end of it. The
small division is still not showing any signs of this, I have my fingers crossed. I still have a
completely healthy Peace Lily that I have had for 4 or 5 years. I would like to know what the blight issue is though. I thought I was watering it carefully. Happen to like Parlor Palms myself! The worst thing about them is the spider mites love them.

I suspect it was a variety of aerial blight that was infecting the leaves of my last peace lily. It's soil born and probably came with the original potting mix. Water splashes the soil, gets on the leaves and the blight spreads. Soil born blights are hard (read almost impossible) to control without extreme measures (I know as I have a type of this blight in my garden soil in places and it's there for life). Symptoms vary with different plants but these blight problems can't be cured with a topical fungicide. I didn't send off for a leaf analysis of my last Spath, so I never knew if it was the blight or my watering that was causing all those black leaves, but as I said after 3-4 of them and me trying to improve my watering with each one to no effect, I switched to an easy peasy Parlor Palm and called it quits........ You might want to google aerial blight and Peace Lilies before you decide what you want to do.........Maryl

I did repot it in new soil, but come to think of it I might have only rinsed the pot
I can't remember now. The small division definitely got a different pot. I deliberately separated it from the rest of the clump because it looked the healthiest. Wet leaves (like after a shower) does seam to cause the problem to worsen. The sick plant is isolated, right next to my foundation (a spot I don't intent to plant anything in). I've been trying the Baking Soda solution to spray the plant with, but I do not think it does much. What research I have done says to keep the foliage dry. It had been that way all winter, yet still I would have some tips go yucky and limp. The spray seamed to at least slow that.
Fred

Fred, do you have chickens?

Have you thought about a massive defoliation? After I read your post here, I noticed something similar going on with a spider plant of mine, so I cut back all the leaves that showed damage. I think mine was due to a recent repotting, I did a number on the fine roots at the top of the root ball to make more room for fresh soil and I think I just over did it....or it has this disease and we'll see.

I do see it putting up a new offshoot/pup (not on the stolons, but emerging from the soil) so hopefully it'll be just fine with some time.

I also have a red aglaonema that appears to be showing signs of this. But it's much more drastic. The older leaves are/were yellowing like crazy. The tips turn a transparent brown color. It was in bloom when I bought it but was also on the clearance rack. One of the blooms was mushy and gross, so I cut it out.

I've since reported it into a Terra cotta pot with very fast draining soil. Sorry for going on and on.....

Chickens? The plant that is outside at the moment is doing no better and NO WORSE. Despite that fact that it has rained heavily in June and the poor guy stayed damp (still is) all month. The small division seams fine. So I don't know.

Yeah, I know a guy named Fred, he has chickens and goes by "FredsHens" online lol.

Fred is not a very common name I've come across in my short life.

Laticauda,
I have a Red Aglaonema that is giving me a terrible time. I have a whole thread on it over
in the Aroid section. Russ has been helping me try to fix the situation.
Fred

I'm also over there, Fred! ^.^

Oddly this thread started out about Hydrogen peroxide spray (for sansevieira foliage diseases) and morphed into the travails of Spathyphyllum LOL!, Sorry Sansevieria lovers.
Fred

I'm easily distracted.

me too! LOL!!

maybe this will be my finale entry on this convoluted topic(s), LOL!
this is the same Peace Lily in July, it is doing better (I think).
Fred

I think it looks a lot better. Did you change the potting medium or watering schedule? Lighting? Clearly it isn't this melt blight because that wouldn't have gotten better? Or do I have it all wrong?

(Maybe that wasn't your last post in this topic Fred)

It is out side in a sheltered location, the only thing I've been doing for it lately is look at it. It was repotted in the spring. Had only on spraying of baking soda solution about 2 weeks ago. Ants have taken up residence in the bottom, so I'll probably repot it again when it is time to come back in. I guess not, LOL! ( just saw the last comment you made)
Fred

I wouldn't bother repotting it, just sprinkle some borax around the pot and underneath it (on the ground) unless you have boric acid then you can use that. That's not really something most people have lying around.

I've also tried cinnamon as an ant deterrent and it seems to work I guess maybe? But without the poison aspect of boric acid. Definitely don't wanna accidentally eat some of that.

borax as in borax powdered soap for hands?

I've always seen it in the laundry soap section. It contains boric acid. That's what makes it effective. Cinnamon maybe better to try first.

just run of the mill grocery store cinnamon?

Yes, preferably organic, but even then it'll just come from China. Nothing fancy, just cinnamon.