They may have fallen victim to a scale infestation that's literally sucking the life out of them. These stealthy little pests ...

The signs of a scale infestation are yellowing and wilting of the leaves, curling of the edges, and eventually defoliation.

Like other scale insects, the first-instar (first-stage ... Preventative control should be considered if there has been a history of infestation in your trees or neighboring areas.