Orchid Pest and Diseases | River Valley Orchidworks
Hope this helps. I am not a disease expert. It may be fungal.
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This is a discussion on Help with this on the leaves within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; The leaves are pitted on Howeara 'Lava Burst', 3 rd picture same on a Cattleya ...
The leaves are pitted on Howeara 'Lava Burst', 3 rd picture same on a Cattleya leaf. No mushiness. Could someone advise what they are?
Thanks Ron for that info. My problem could be bacterial?
I am not an orchid Guru but would suggest remove some affect leaves treat with mancozeb ,repot if necessary maybe if new growth appears you might save it from premature death death maybe put in quarantine cheers Richard
More airflow and avoid wet leaves especially at night
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I agree with jai_star, that looks like good old water damage due to drops remaining on the leaves overnight during cool weather. I had that problem for a few weeks when I first moved all my orchids from indoors into my greenhouse. They loved all the extra humidity and it led to a huge amount of extra growth, particularly aerial roots, but during those first 2 weeks all the flowers were damaged and many plants showed exactly the same damage on their leaves as you have on your plants. I changed the humidifier to only work during daylight hours and I put 3 large fans into the greenhouse that work 24/7, which sorted the problem straight away. I still get some of these spots every now and then and it's always the result of watering the plants too late in the day. Even if your plants are very dry because you've been away from home or for whatever other reason, it's best not to water them in the afternoon or evening, particularly during cool weather and in winter, and simply make sure you get up early and water them the following morning instead. One more night without water won't kill your plants, whereas the spots you get from water damage are permanent and remain on the leaves until they're shed.
Thanks Tony for your reply. It does sound like moisture on the leaves, more than a virus. Here in Sub-Tropical Queensland, we have had a lot of rain mainly in the afternoons and at night. I have never watered in the 'noon', usually very early in the morning. But as my orchids are housed outside in a shade house, I cannot control the water damage. We are at present on the move, hence my late answers to my query. Trying to move 150 orchids to my daughter's house, which will be cramped for my babies for awhile, till my new orchid house is built at new home. I will have to monitor them at my daughter's house, until they can be spread out in new home. The hardest part of the "move" has been my fanatical obsession with my orchids. I have some beauties in flower at the moment, but unfort. cannot take the time to take photos and show. But have attached 1 which contains some of my flowering beauties.
Good luck with your move! Nice Catt!!
Hope the move goes well, and I love your catts!
Thank you Tony, for this info. Very interesting. I have a Miltonia, I've just bought, and it has the odd spot on it. I think this may be its problem!