White fungus on branches like sticky powder.
White Fungus on Branches Like Sticky Powder
Certified GKH Gardening Expert
The white powder you mention sounds like powdery mildew. However, the sticky stuff that you speak of sounds more like a pest of some kind, mealy bugs, aphids, spider mites or similar sap-sucking insect. Here are some articles that you may find helpful: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
All of these can be taken care of with neem oil. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm