Fruit flies won't damage orchids. But once leaf damage occurs, it doesn't go away. Your goal is to keep it from spreading, and I think that your treatment likely did a good job of eliminating whatever was causing it. Oncidiums tend to get ugly leaves just because their thin leaves are easily damaged.
You mention "soil" ... epiphytic orchids (like Oncidiums) don't grow in soil - they need an open mix that allows lots of air in the root zone. They don't want to dry out completely (unlike some other types) but air is critical. That's why people use bark, or inorganic media such as LECA. There are lots of ways to achieve the goal depending on your conditions and watering practices. Have you repotted it?
Last edited by Roberta; 06-08-2023 at 03:49 PM..
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