Today, while driving through North Dallas, I saw many trees that had contracted what I call "Builders Disease." This disease is a slow killer of trees resulting from new home or pool construction being done without proper protection of the root zones. Interestingly, complete death occurs as much as three or four years after constructiuon is complete so homeowners typically attribute the cause to something else.
The key causes are most often soil compaction from construction equipment, root damage due to excavation or concrete pavement over much of the root zone. The typical symptoms are a slow process of diminishing vigor in the tree. Each successive year the canopy gets thinner. Increasing amounts of die-back also are characteristic. The amount of time it takes for complete death depends on the species of tree and the extent of root damage. Since the tree's vascular system in vertical and linear often the tree die-off will first occur on the construction side of the tree.
Prevention is the best approach to save the trees through a variety of measures. However, if caught early, this "disease" can be treated through a combined approach of aeration and fertilization of the root zone.
If you have this problem contact Heritage Tree Service of Texas at 214-244-8411 to get valuable help.
Over the years I have seen and worked on trees that have a distinct yellow foliage. Some would describe it as chartreuse or lime green. Trees should not be yellow.
The condition is called chlorosis and is caused by a nutrient deficiency in the tree - primarily iron which aids in production of chlorophyll (green pigment). Most often the trees affected by this condition are those species preferring acidic soil such as Pin Oaks, Dogwoods, Sweetgums or Magnolias.
I find the most common culprits in our area seem to be Pin Oaks or Pin Oak hybrids that were sold and installed as Red Oaks. The leaves look very similar to those of Red Oaks but once they are installed in Dallas/Fort Worth's alkaline soil they cannot absorb iron and turn yellow. Most of these trees succumb to the problem before they get large but some having less of the Pin Oak traits can grow larger before they display yellow foliage.
Solution: For larger trees having less Pin Oak traits it may be most economical to apply regular soil amendments that can neutralize the alkalinity in the soil. This will allow greater iron absorption in the trees. There are a variety of ways to do this and can be handled by an arborist. If the trees are small, the best approach is to remove the trees and start with a true Shumard (Red) Oak that is guranteed by the supplier. This way you will be sure to avoid yellowing problems in the future.