Branch Disease Branches Turning White Leaves Brown

Question

In the past 3 weeks healthy branches have been turning white and lemons are dropping off. Leaves are turning brown. I live in Wildes Meadow southern highlands of nsw.

Answer 1

It could be a cottony cushion scale infestation. Here is more info as well as info on environmental concerns:

https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-fruit-drop.htm
https://www.gardeningknowhow.com/edible/fruits/citrus/controlling-citrus-scale.htm