Pests and Diseases forum→Brown / rusty spots

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Katkatkat
May 3, 2020 9:28 AM CST
Hi everyone,

This large plant (no idea what plant it is) has a bunch of rusty spots, which look slightly elevated on the bottom of the leaf. I don't see any insects.

I had it for about 3 years. It has never been repotted.

Any idea what's going on?

Thank you so much.





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[Last edited by Katkatkat - May 3, 2020 9:31 AM (+)]
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Name: John
Pomona/Riverside CA (Zone 9a)
CPPgardener
May 3, 2020 10:49 PM CST
Welcome! to the forum.

Your plant is a philodendron, possibly Xanadu (although I'm not positive).

The bumps on the underside of the leaves look like edema, which is caused by excess water under high humidity conditions. Not wet enough to cause rot, but enough to damage the epidermal cells. If you can lower the humidity or dry out the plant things should improve. The bumps won't go away but they shouldn't get any worse. The browning around the bumps is possibly damage extending outward. You can remove the worst looking leaves and then you will be able to tell if it's getting any worse or better.

You don't need to repot the plant, although you can add some fresh potting soil on he bottom to raise the soil level and give the roots some room to grow. This also acts like fertilizing since the new soil has more nutrients than the old soil. When you add soil to the bottom you will also need to add soil around the sides as well.

Happy plant parenting!
“That which is, is.That which happens, happens.” Douglas Adams

Katkatkat
May 4, 2020 8:58 AM CST
Amazing, thank you so much!

mountainmanjoe
May 14, 2020 1:47 AM CST
looks a bit like rust fungus too


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