If you're seeing brown spots, tan lesions, or premature leaf drop on your oak trees right now, you may be looking at Tubakia leaf spot, a fungal disease that tends to show up on oaks across the Tennessee Valley right around this time of year.
Here's how it works. Tubakia is caused by a fungal pathogen that overwinters on infected leaf debris and then spreads through splashing water and humid air during warm, wet spring conditions. Chattanooga's late spring weather, warm temperatures and regular rain, creates ideal conditions for it. Affected leaves develop brownish spots, often with a darker border, and may drop from the tree well ahead of fall. On some trees you'll see spots cluster along the midrib of the leaf.
The good news: for most mature, otherwise healthy oak trees, Tubakia leaf spot is a cosmetic issue more than a fatal one. A healthy tree can handle moderate defoliation and still recover. Where it becomes more serious is when the tree is already stressed by drought, soil compaction, or recent damage. In those cases, repeated infections over multiple seasons can weaken a tree significantly.
If you're seeing this on a tree that was already struggling, or if the infection looks severe, it's worth having someone take a look. Our ISA Certified Arborist can assess whether the tree needs support or whether watchful waiting is the right call this season. Visit treeworxllc.com or give us a call.
Have you noticed any unusual spots or early leaf drop on trees in your yard this spring? #Chattanooga #TreeHealth
Close-up photo of oak leaves showing Tubakia leaf spot symptoms, or a broad canopy shot of a tree with irregular browning. Real Chattanooga or Tennessee Valley job photos are strongly preferred over stock images.
Canva text suggestion: "Brown Spots on Your Oak? Here's What to Know." or "Tubakia Leaf Spot: What Chattanooga Homeowners Are Seeing"