Q.Can you please tell me what this is on my tree.
It appeared last Spring and again this year. Is it harmful to the tree?

Downtoearthdigs
Answered on June 13, 2019
This is a large Mealy Bug infestation.
Began treating with Neem Oil.
These links will help you.
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-pest-problems.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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