Quote:
Originally Posted by Selmo
Merita, It is hard to tell, but photo 1 the top leaf looks similar to sunburn, and the under leaf looks more like cold water damage. If cold temperatures were the only culprit here, I believe that the flowers would bare the brunt of the damage and they look pretty good. Once again it is hard to tell from just the one picture.
The second photo is hard to tell what is going on there too. Is it shadow or is it damage on the leaf? That bud should tell you if it was cold damage or not. If it blasts then probably cold, if not probably something else. Cattleyas usually can take fairly chilly temperatures. Lower 40s they should be good, maybe even upper 30s, you maybe OK if the plant is healthy and mature.
The third photo, I don’t know if that is cold damage, looks more like one of the leaf spot funguses. But again it is hard to to tell from one photo. I would ask others in your area or at your local society, if they have had similar damage on their cattleyas due to Cold temperatures. All of these plants look as if they will be mildly effected by this and should recover. Make sure to watch for bacterial or fungal out breaks in these damaged areas in the next few weeks.
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All this has happened in the last weeks, first they are purple spots and they become like this, some darker than others; the tips of the leaves and the edges of several plants are getting like this, I have noticed that for the part that gives more cold air, they are more burned. Cold nights continue with a morning of 99% humidity; I do not doubt that some sunbeam will also enter through a corner. I am constantly watching but always have been. Last year there was colder and nothing happened to them, maybe they have calcium deficiency, I plan to put this on these days. Here I do not know anyone who has orchids and I am very afraid that some disease will sprout, I have only been applying hydrogen peroxide in the spots, once, they have not been enlarged at the moment.
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