This is an old thread. It would be better if you started a new thread. More people would see it. Go to Forums and select a forum. You could post this question in the Beginner forum, the Pests and Diseases forum or the Angraecum forum.
Angraecums prefer high humidity, though they will grow in a typical home. High humidity orchids frequently develop small black spots in low humidity. It is not a big deal. Some Oncidium hybrids are known for having lots of spots no matter how you grow them.
Rots are very rare in a home environment unless temperatures are much too high or much too low. Fungi and bacteria generally are problems of high humidity environments. Even if infections occur, it is almost always because conditions are off. Healthy plants in a good environment seldom develop rots. If you see something that looks like an infection, your first thought should be of how to improve the growing conditions.
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