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Click below images to enlarge...

sinningia sinningia

This is probably Sinningia Ozark Coral Freckles. I put it in a aquarium with artificial light on from 8:00am to 0:00am. The distance to light is about 20cm.

The young leaves were fine until they grew bigger and I found yellow spots within their leaves. I also spotted 2 tiny red dot things ( tiny, like dust ) on the leaves. I touched one of the red dots with a tool and it didn't move; I picked it out. I don't think they are red mites.

Any clues as to what is causing the yellowing?

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I consulted some friends in internet. They said those are watermark caused by too much humidity. I think it is quite reasonable. Maybe I will move it out of the aquarium later.

  • I believe your friends could well be right, the following comes via the first link I posted above, Gloxinia -- Water from the base, not the top and use only tepid water. Any water getting on the leaves will cause spot diseases. – Mike Perry Sep 22 '11 at 5:22
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    And this link: Bacterial Leaf Diseases of Foliage Plants -- talks about the importance of not wetting the leaves & high humidity, both of which can cause problems resembling what you're currently seeing... – Mike Perry Sep 22 '11 at 5:39

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