A hit from a car or mower can tear away bark and the living tissue under it. Here is what to do next.

Stake ties and wire left on too long slowly strangle a trunk. Removing them early is one of the easiest saves in tree care.

Suckers and trunk sprouts are the tree's response to stress, injury or rootstock vigor. Here is how to handle them.

Many Tucson homeowners worry when their tree yellows in fall. Usually it is a healthy tree getting ready for winter.

That odd brown-and-white caterpillar on your lemon is the young of the giant swallowtail butterfly. Here is how much damage it really does.