Aloha,

The plumeria leaves get a orangish spotting on the underside of the leaf, which the plumeria grower says is a fungus. It's powdery and dry, like a fine dust. In 
late August, the grower says that there will be "thousands" of bees, collecting this substance and he's indicated that it's being stored "on their legs".

The bees do not collect nectar from the plumeria (needs long tongued insect like moths).

My first thought was that the fungus may be exposing sap, which could be a component in propolis, but the grower says that the plants are not affected 
(although in late August, the leaves fall off the tree).

Any ideas on what they are collecting?

Thanks,
Howard in Hawaii

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