Ash Tree Dead Branches


Watering nonnative trees in Mesa AZ


Whiteflies in Temp AZ


The ash tree is a handsome, native, deciduous tree. There are over 60 ash tree species— the white ash being the largest of the family.

The ash tree is a strong, medium to very large tree, depending on type, and a relative of the olive tree. Ash trees have an opposite branching structure, with multiple leaflets. 

Depending on species, ash tree leaves are green, turning yellow or purple-burgundy in the fall. Spring flowers are inconspicuous, but the fruit that follows is more noticeable, hanging in clusters of winged seeds which turn light brown and linger on the tree until early winter.

The ash tree has a lovely rounded crown and gray diamond-shaped furrowed trunk when mature. An interesting fact about the ash tree is its characteristic agile wood is used to make baseball bats.

How to Grow: Most ash tree varieties grow best in moist, rich soil; require full sun and plenty of space.

Size of Tree:     50 to 80 feet high / 50 to 90 foot spread

Ash trees are susceptible to ash tree borers and other pests and disease. Keep ash trees as healthy as possible through regular monitoring, pruning, fertilizing and watering. By following these steps, you can help prevent ash tree problems from starting.

Newly planted ash trees can benefit from ArborKelp®, SavATree’s exclusive seaweed biostimulant which aids in tree establishment, promotes root growth and heightens stress tolerance.

Mature and established ash trees benefit from ash tree fertilizer feedings of organic-based macro and micronutrients for the nutrition necessary to sustain their health.

Ash Tree Pruning
Arborist Consultation Ash trees should be trained to grow with a center leader and require pruning to develop a strong structure especially due to their opposing branch structure.

Pruning is recommended to preserve or improve tree structure, vigor and life-span. Pruning can reduce specific defects or structural problems in an ash tree to greatly lessen the risk of failure.

Broken, diseased, or dead ash tree branches are typically removed in order to prevent decay-producing fungi from infecting other areas of the tree. Also, removal of live branches is occasionally necessary to allow increased exposure to sunlight and circulation of air within the canopy. This assists in reduction of certain ash tree diseases. We also advocate the removal of branch stubs to promote successful and proper healing of wounds.

There are several damaging ash tree diseases and pests. Some of the most common are:

Anthracnose – This disease results in extensive defoliation, shoot dieback, and twig death of ash trees. Often confused with frost damage, signs of anthracnose include brown areas on ash tree leaves, canker on the trunk and main branches, and purplish-brown areas along the veins of the leaves.

Ash Yellows – This disease affects mostly white and green ash trees.  It is characterized by a loss of vigor over the years. Leaves may start to yellow and develop early fall color. The ash tree may lose leaves and cankers may start to form on the trunk and branches, causing dieback.

Verticillium Wilt – This infection results in cankers and dieback.

Other Ash Tree diseases and Pests include:

Banded ash clearwing, Ash flower gall mite, Ash rust, Powdery mildew, Ash Anthracnose,  Cankers, Butt rots, Root rots

Many of these insect and ash tree disease conditions can weaken the tree and lead to tree death if not treated. If you suspect a problem with your ash trees.

The massive mile high dust storm we had in 2013, has spread mites and other insects throughout the valley like I've never seen. This increase in insects and the record-breaking heat of 2011 has dangerously stressed many tree species, particularly the ash trees.

Ash Trees are susceptible to wood boring insects. Common symptoms are, branch dieback, and thinning canopies. A symptom common with ash trees infested by carpenter worms and other ash borers is bark shredded off by woodpeckers searching for the larvae.

To make matters worse the Ash Fly is now in the valley and I have seen it in many trees including Ash and Citrus.

I have personally seen this pest completely defoliate large Ash Trees to learn more please watch the video on this page.and download Help For Sick Ash Trees on this page.

What to do:
1 Increase watering immediately. Notice how well large Ash Trees do in lawns that are green all year long. See Watering Non-Native Trees on this page.

2 Starting immediately - treat your Ash Trees yearly with Bio Advanced Tree and Shrub. Treat your tree annually as the deep borers are hard to kill. You can get Bio Advanced Tree and Shrub at Home Depot.

3 Have us treat your Ash Trees with medicines that will accelerate the healing process from the damage done from the micro pathogens carried by insects. Good Luck Warner.

I hope you found this page about Tree Diseases in Mesa AZ useful. If you have any questions about Tree Disease please contact our Tree Service to schedule an appointment. We have been treating sick trees for over 50 years. We currently serve, Mesa AZ, Gilbert AZ, Chandler AZ, Scottsdale, Phoenix AZ and all of Maricopa County AZ.

We currently serve - Mesa Az. – Gilbert Az. - Tempe Az. - Chandler Az. - Queen Creek Az. - Scottsdale Az. – Paradise Valley Az. - East Phoenix Az.