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Help! What’s the cause of this on my calathea setosa?

Dear all, 

I’m new to this wonderful forum, and a totally new gardener! 

I was wondering if anyone can let me know what’s wrong with my calathea, and I’d also appreciate any advice on what I should do to keep it happy and well! 

It is currently sitting on a rack by the toilet and window, which gets some afternoon sun. I water it once a day, misting about once or twice a day too. It keeps putting out new leaves - one every 3-5 days, so it doesn’t seem to be that unhealthy but I have a few issues I hope the hive mind can help me solve! 

Problem 1: pinhole like spots on the surface of the leaf. 
The back of the leaf. The pinholes also seem to ooze a bit of liquid? I see no creepy crawlies though… 

Problem 2: brown spots on leaves that don’t go away. Not every leaf develops this, but out of the 20 or so leaves, maybe 4-5 of them have it. Any idea what they may cause this? 

Very grateful to hear from anyone with experience! :) 



  • CeresCeres Posts: 2,574
    Hello and welcome to the forum.
    Your plant may have spider mites. These are very small and you will probably need a magnifying glass to see them. They produce a fine web but this may not be apparent until the infestation gets bad.
    You can buy biological control for these pests but if you go down that route, make sure the mites can't run up your arm (as happened to me) because that is just a good way to waste money.

  • Hi Ceres, 

    many thanks for your reply -  I just looked closely at the leaves under magnification. However, it doesn’t seem like there is anything on them - the underside of the leaves in picture 1 actually seems to show “holes” with light passing through them instead of little mites that move around. I disturbed the leaves and the spots remain in the same position(Ie. They don’t run around), so perhaps they don’t seem to be spider mites? 

    Any other thoughts?:) 

  • B3B3 Posts: 26,954
    Thrips make little holes sometimes.
    In London. Keen but lazy.
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