Ok, so I'm just spitballing here, but I have these on my truncata, and it is my personal belief that they are the result of large leaf jumps after fertilization. Making less "hardened" leaves more quickly...
But, I could be wrong...
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my highland truncata's new leaves looked similar to that during the hot summer months when it was not getting the cool night and somewhat mild day temps. just my 2 cents. what conditions is yours being grown in
OK maybe I'm blind. What are we looking for on the leaves?? The white bleached out spots??
Thanks for all the replies! Encouraging to see that nothing 'terminal' has been written so far. I grow the plants in a north facing room under lights at room temp here in rainy London. As I said I think I may have put orchid fertiliser at week strength on them during the summer. It's called Orchid Focus 2.2:1.2:2.1. To complicate things the mottling started when we had just about the only heatwave of the summer when night time temps didn't drop below 25 degrees (it killed off my singalana :'-( the high temps lasted about a week. I thought robcantleyi was intermediate, so surprised if it was the heatwave? BTW that new leaf is opening now and temps are back to normal, 21 during day and 15 at night.
It is conceivable that a stretch of 25C nights might cause some problems. You might assume so and just watch them over the winter to see if it persists. I suspect it won't.
Thanks very much Paul. I'm sure it will grow out of it and I'll stick to coffee as a fertilizer from now on. I have consoled myself with purchasing a furry red hamata
Weak orchid very will not cause that. The tempos might. I've had something similar on one if mine and its growing out to of it.
Drool. A hairy red.....a dream ATM.