| Spraying with some pesticides may be a problem, but since you live in a very different part of the world, what you use may not be familiar to us for us to give you any help on this. But you may want to give us the name any way. Your problem does seem quite old. I would check the roots to see if the excessive wetness may have rooted off the roots and the plant just can't support the leaves. Or, maybe you had a bad case of some kind of bugs, and if the plants don't have a bad reaction to the pesticide, you may have solved the problem. It is a really good idea to have a strong magnifying glass or an approximately 4 power jeweler's loupe.
If it is just a fungal problem, then the best guess is that there is something wrong with your culture, like the plant getting to cold at night. But that sounds unlikely where you live.
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Cynthia
Prescott Orchid Society  |