meyer lemon tree dying

Question

We have a Meyer lemon tree that has little white bugs on it and the tree looks like it is dying. Most of the leaves have fallen off. What causes this?

Answer 1

A photo would aid in identification but I will give this my best shot:

It could be a citrus whitefly:
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-whiteflies-houseplants.htm

Thrips:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm

Mealy bugs:
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm

or scale:
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm