Why are the leaves on my maple tree turning yellow?

If the leaves on your maple tree have started to yellow too early, it may be suffering from chlorosis. Chlorosis is a disease that results from nutrient deficiency, typically in iron. It manifests as yellowing leaves, with the veins remaining green. This is due to the fact that chlorphyll, the molecule responsible for photosynthesis, requires iron to function. Trees that become diseased with chlorosis can sustain many types of damage, such as:

  • reduction in fruit and flower production
  • stunted growth of the tree
  • decline in overall vigor and health of the tree

Could my maple tree be stressed?

What does it mean for a tree to be stressed, exactly? Well, it’s similar to when a human is stressed. Environmental factors lower the immune system and make it more difficult to thrive and function properly.

Recently, many maple trees have been under stress due to environmental conditions. The last few years have brought extreme heat and drought to Colorado, followed by harsh winters with below-average temperatures, making it difficult for trees to recover. In addition, we’ve seen an increase in the amount of damage caused by frost.

What does stress and frost damage look like?

Maple trees that are stressed or have sustained frost damage may display any of the following signs:

  • leaf buds that haven’t swollen or opened by spring
  • crackled and flaking bark
  • browning or blackening of damaged tissue
  • shriveled and discolored leaves
  • dead or dying branches

What can be done?

It’s important to take action and consult with one of our certified arborists to establish a proper pruning and treatment plan. A preventative maintenance plan is essential to support the long-term health of your tree. Watering and fertilization are also an important factor to help maintain healthy growth and give your trees the nutrients they need to recover from environmental stress.

Sadly, trees that have been left untreated for too long may never fully recover. If removal is necessary, it’s crucial to consult with an expert who can safely remove your tree. Damaged trees can be extremely hazardous. Our certified arborists can work with you to identify specific problems and determine the best course of action.

Are Your Denver Trees in Need of a Good Trim?

Contact our certified arborists to book a free tree-trimming consultation today!