Many orchids produce a substance called honeydew from special glands. One usually finds these glands on new growth. Their function is to attract ants which then will drive away leaf eating insects. The best way to identify honeydew is to simply get some on the end of your finger. It it is sticky and tastes sweet, it is honeydew. The only possible problem may be that mold might begin growing if there is lots of it. It can easily be rinsed away with a spray bottle.
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