Tree galls become more visible in late winter or early spring, when trees are bare.
If there are abnormal tree growths on your twigs, leaves, or branches, these may be tree galls. They are similar to benign tumors or animal warts; they are often mistaken for fungi or disease. Tree galls become more visible in late winter or early spring, when trees are bare. Keep reading to learn more about what causes tree galls, where they develop, and if they cause concern.
The Causes of Tree Galls
Galls develop due to insect feeding, fungi, mites, and bacteria. This happens when a new growth issue swells and encloses the invader. The walls of a gall are structurally robust, full of protein, and provide food and protection to the larvae inside. Gall wasps, aphids, midges, and eriophyid mites are among the most prevalent culprits of insect galls.
Look Out for Signs of Tree Galls
Tree galls form in spring and may persist through the growing season. The signs of tree galls include:
- Tree galls appear as bumpy, blister-like bumps on leaves.
- Swollen galls on tree branches and twigs.
- They often occur underground in the roots, caused by aphids or nematodes.
Types of Tree Galls by Species
Here are some prevalent types of galls by species:
- Round, abnormal growths on the underside of oak leaves and stems.
- Red, puffy growths on maple leaves.
- Swollen growths at the base of Hickory leaf stems.
- Reddish growths on the leaf veins of elm cockscomb.
- Appear like a willow pinecone at the stem tip.
When to Contact a Certified Arborist
While tree galls don’t appear attractive, they rarely kill a healthy tree. However, if a younger or stressed tree has an infestation of tree galls, it can alter growth and make it more vulnerable to stress.
As a locally owned and operated business, our customers appreciate that they can trust Harford Tree Experts and Landscaping to manage their tree service needs. Our certified arborist, Mark, and his team have the expertise to identify gall types and evaluate their long-term impact.
If you are unsure if the growths on your trees are harmless or harmful, contact us at 410-592-7321 or email us for a FREE ESTIMATE today!
Tree Care and Maintenance from Harford Tree
Ready to have the beautiful yard you have always dreamed of? Harford Tree Experts & Landscaping, Inc has been in the business for decades, providing customers with quality work and quick responses all at the right price. We service the areas of Harford County, Baltimore County, and Baltimore City areas including Bel Air, Fallston, Perry Hall, Towson, Essex, Parkville, White Marsh and Middle River.
For service during business hours, reach out to us or give us a call at 410-592-7321. We offer 24/7 emergency service as well, just give us a call at 443-250-6649. For updates about our business and more informative tips, follow us on Facebook and Twitter.