DMT-Nexus member
Posts: 641 Joined: 03-May-2009 Last visit: 24-Mar-2023
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Can anyone tell me what's going on in this picture? Is it a pest or virus? It's on the underside of the leaves. I haven't seen any white flies in here since I bought several carnivorous plants and they seem to be coming out of the plant itself. imPsimon attached the following image(s):  IMG_6930.jpg (2,441kb) downloaded 56 time(s).
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DMT-Nexus member
Posts: 641 Joined: 03-May-2009 Last visit: 24-Mar-2023
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I think I have found the culprit. It's called "edema". (If you google it make sure to write "plant" before "edema", otherwise you'll get pictures of a nasty human disease you don't want to have) In short it's when the plant takes up more water from the roots than is dispersed trough the cells and...uh, something breaks, creating those blisters?? I have only skimmed the information yet since I'm rather tired. http://www.hort.uconn.ed...m/greenhs/htms/edema.htm
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DMT-Nexus member
Posts: 1711 Joined: 03-Oct-2011 Last visit: 20-Apr-2021
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Yes, that looks like edema. Good catch. As you may have figured out already, treatment involves allowing for higher water transpiration in leaves (higher temperature, lower humidity, more ventilation) and lower water retention in the soil (decrease watering, improve drainage, change soil if waterlogged). Keep the leaves dry if possible, water in the morning, watch out for pests and mites for as long as the symptoms persist, and avoid spraying chemicals in the leaves for a while. "The Menu is Not The Meal." - Alan Watts
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DMT-Nexus member
Posts: 641 Joined: 03-May-2009 Last visit: 24-Mar-2023
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Thanks for the tips.
The plant is about 15cm high and just (2-3 weeks ago) transplanted it to a larger pot in the same time as
some other plants.
It's a mix of cactus/sowing soil (not very nutritious, has sand in it) mixed with perlite but I can also see that I have
thrown in some vermiculite.
You think I would fair better without the vermiculite?
It's really not very moist in here and the plant is standing close to a radiator in the window.
I always lift my plants to feel how much water is left in the pot so I wont over water.
The vermiculite is the only thing that I can think of really.
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DMT-Nexus member
Posts: 1711 Joined: 03-Oct-2011 Last visit: 20-Apr-2021
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Vermiculite does hold water but it helps drainage too... unless the soil is waterlogged or moldy, I see no need to change it. And if you are not overwatering... what about placing a fan near to it? A little USB fan would do. "The Menu is Not The Meal." - Alan Watts
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DMT-Nexus member
Posts: 641 Joined: 03-May-2009 Last visit: 24-Mar-2023
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Before I got your reply yesterday I removed that one leaf with a lot of blisters.
The remaining true leaves (5 of them) looks fine.
For the moment I will just watch the plant everyday and keep the watering down and
see how it progresses.
Thank you for the help, much appreciated!
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