gary, this link is to my recent thread on bacterial infection. Pics arent great buts its one view and aimed at growers to keep an eye out for it.
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This is a discussion on Dealing with Bacterial diseases within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Could someone post a picture of both fungus rot and bacterial rot? I am new ...
Could someone post a picture of both fungus rot and bacterial rot? I am new to this hobby and want to learn as much about it as I can.
Thank you, Gary
Thank you for the link. I was looking at one of my noid orchids and noticed what appears to be black mold. It is down the edges of the leaves and some spots under one leaf. The reason I describe it this way is that it looks like mold that was on one of my boat seats. What would be the best way to treat this. With dilute bleach or hydrogen peroxide and should I treat in the morning or anytime?
(edit--for greenhouse or large indoor growing area), Beside chemicals, a dehumidifier and an extra fan can be very helpful too.
I have been misting as well as having the plants on pebble trays. A ceiling fan is going constantly. Could it be too much humidity? I may try wiping down the visible areas with a mild bleach solution. Any advise?
Here are some good links:
I already have three fans, which usually has been enough. Normally the difficult month for me when I have to be ultra vigilant is October, when night temperatures are around 10C and day temperatures around 15C. In a normal year it starts to get cold and the heating kicks in (and acts as a de-humidifier) in November. This year we had "October weather" all through the last three months. If that turns out to be a pattern for subsequent years, I will need to look into a dehumidifier )-:
In retrospect, I think I have had problems with bacterial brown spot in the past and misdiagnosed. In past years it was short lived. A few brown spots typically on a few Gongora, Catasetum and Stanhopea leaves in October. I would cut them off and then the problem would be gone.
For everybody reading this: changing cultural conditions is preferable to using chemicals and more effective. Chemicals are no silver bullet: they don't usually cure; they only slow down and can help avoid new infection.
I am glad my collection is small (42 orchids). These past two winters have been a challenge for the cattleyas, especially. I just went through black rot that somehow spread even to the cattleyas in other rooms. Keeping the catts dry, removing the infected parts of the plants and wiping down with alcohol everything but the roots, twice a day, for several days, saved all my cattleyas except the one I forgot about...oops. Last year, it was a nasty brown rot. I have aerangis and some others I think might be sensitive and grow in the home so I have been saving the more powerful things for the fruit trees and roses, so far. As alcohol ruins blooms and roots, I can't see how it would be effectively used on a large scale but for a small collection, it has proven effective to me.
Hope you get rid of the problems,
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This evening I took a cotton swab and alcohol and rubbed the mold and it came off. I don't know if I got it all, does anyone have any suggestions on what I should do to make sure I got it all?
black mould may not be an issue. It can happen in high humidity when sugar residue is on leaves. You may have had some greenfly once, or some orchids secrete some sugar. You can use a baby wipe or other wet wipe to wipe it off. Watch the plant afterwards, in case it is something more serious.
Thanks Lars. All of my orchids (3) are NOID phals. I will keep an eye on it.