As living beings, trees can get sick just like humans and animals can. Trees can become diseased due to insect infestation, bacteria or fungi, or unfavorable weather conditions, among other reasons. While it may be troubling to see a diseased tree on your property, the good news is that, with early and proper treatment, most trees can overcome disease and continue growing and thriving.
What are the signs of a diseased tree?
All trees, no matter their age, have the potential to become diseased. Changes in leaves—browning or yellowing, streaking, or falling out of season—are one of the earliest signs that a tree may be stressed. You may notice branches with uneven or stunted growth, particularly at the top of the tree. A tree’s bark may also show signs of disease, such as cracks, dark patches, fungus growth, or oozing. If you notice any of these issues, it’s time to investigate further.
What are common tree diseases in Hampton Roads?
There are several common tree diseases in the Hampton Roads area.
- Anthracnose: Anthracnose is a fungal disease that commonly affects dogwood, sycamore, oak, and maple trees. It typically occurs in early to mid-spring and is characterized by black spots on leaves, leaf curling, and early leaf drop. The wet weather that our region experiences, especially in the spring, can often exacerbate anthracnose.
- Powdery Mildew: This tree disease affects maples, oaks, crape myrtles, and dogwoods, among others. It can be identified by a white, powdery coating that is found on the surface of leaves. Powdery mildew can stunt new growth and, in some cases, cause leaves to fall out of season. This disease is most common in the summer as humidity can spur its growth.
- Verticillium Wilt: A fungus in the soil that enters the tree roots causes verticillium wilt. This disease can impact many types of trees, including maples, ashes, redwoods, and elms. Leaves of diseased trees look yellow or brown, and there may be a sudden wilting of leaves on one side of the tree. Verticillium wilt often rears its head in late spring and early summer.
- Cankers: Characterized by discolored, cracked, or sunken areas of bark; trees commonly affected by cankers include maples, oaks, spruce, and pine. Sometimes cankers ooze sap, and branches in the area of the cankers may experience dieback. Caused by fungi, cankers can appear at any time of year.
- Apple Scab: Apple scab affects crabapple and other ornamental fruit trees and can be identified by black spots or lesions on leaves and fruit, as well as dropping leaves. This disease commonly rears its head in mid- to late spring or early summer.
How do you care for a diseased tree?
Treatment for a sick tree varies based on the root causes, so it’s important to identify the specific disease affecting your tree. Fungus-related diseases can be treated with fungicides, while chemical sprays may be used for bacterial infections. Pruning is also commonly used to manage disease spread.
Is there a way to prevent trees from becoming diseased?
Maintaining a healthy environment for your tree is one of the best ways to prevent disease. Prune your trees regularly (preferably in dry weather), remove diseased or dead leaves, and mulch appropriately to ensure adequate air circulation. Avoid damaging roots and address pest issues promptly.
If you notice any signs of disease in your trees, Arbor Experts can help. Our tree professionals can identify the issue and offer solutions to manage disease. Contact Arbor Experts at (757) 500-8733 (call or text) or submit an online request for a free evaluation.
