Sick Polyneura,fishtail hoya
I have a Fishtail Hoya that was beautiful and doing very well. Then she started dropping leaves and looking very spindly. So, I made sure I didn't over water, checked her for mealies. Well, no mealies that I could see ( I used my jewelers magnifyer) and I wasn't overwatering. However on further inspection I did notice that the leaves had a white powdery looking residue on them. Like the white substance that oozes out of a stem when cut, only dry.. This white stuff appears at the very tip of the stem where the two leaves meet. My conclusion is that something is chewing away at the leaves at the very end where the leaf and stem meet. The leaves are being robbed of the nutrients from the stem thus the leaves die and fall off the stem....
Ok..but I don't see any bugs...? What have I missed? Could it be a fungus of some sort?