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Originally Posted by SouthPark
Merita. It 'may' be sunburn/sunscorch. The leaves can be more prone to it if there has been any spray of plant treatments on leaves containing oily substances.
Also - the leaves appear to darkish green, as if the orchid hasn't yet been sun-hardened. If that's the case, then strong sunlight bombing the orchid leaves may well cause the dark patches. On the other hand, I can see at least two leaves (yellow-green) which do appear to be sun-hardened.
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Leaf burning can be expected sometimes for outdoor orchids, when light intensity from the sun at certain times of the year become a lot more than usual.
If this is/was happening, then shading is one way to prevent the scorching. If the leaves dry up and don't become mushy, and eventually changes from the black colour into a light brown or grey/tan colour (over a long time), then that will be good.
Has this orchid been on that tree for a relatively long time? |
The brown spot appears in one day and is like sunburn, but can it burn so cold? This is happening in many plants and new shoots. Every day I am checking them and putting alcohol on the spots, some of these spots have turned light brown but are not removed. I have to transplant five plants and I dare not, the temperature is very unstable. These cattleyas receive a lot of light although they have that green color, their leaves are hardened and the anthocyanin has them purple. I wonder why this year is happening and not the past, will they lack calcium?
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