Painted dot or living growth? Start here
Orange dots on a tree usually fall into one of two groups: paint someone applied on purpose, or something growing on the tree. A quick check will usually tell you which.
- Paint: flat, even color, often a neat circle, band or X, with a sharp edge. It may be at eye level and visible from the street or a path.
- Growth: textured, bumpy, crusty, gelatinous or powdery. It can be irregular, spread across bark or leaves, and may change in a few days, especially after rain.
If it flakes off like a crust, or it feels soft and slimy, it is probably biological rather than paint.
What painted orange dots usually mean
Cities, utility companies, foresters and surveyors use spray paint marks, and the color code varies by place, agency and even project. An orange dot or mark can mean a tree is flagged for inspection, treatment, pruning or removal, or it may belong to a forestry or survey plan. In some places, orange is also used for utility markings.
Because there is no universal code, the reliable approach is to ask:
- Call your city or town’s tree or public works department if the tree is on public land or along the road
- Contact your electric or utility company if the tree is near power lines
- Ask the property owner or land manager if it is in a park or woodland
Do not remove or paint over marks on trees you do not own, since they may be part of an official plan.
Orange fungus and growths on bark
If the orange is a living organism, these are the usual suspects.
Rust fungi
Rust fungi can produce bright orange to rusty powdery or gelatinous patches. Some form swollen galls or cankers on branches, and many alternate between two host plants during their life cycle. Pine stem rusts and cedar rusts are examples.
Jelly fungi and bracket fungi
Some jelly fungi, such as those in the Dacrymyces group, form orange, gelatinous blobs on dead or decaying wood. They shrink and harden when dry and swell after rain. These grow on dead wood, so they typically suggest that part of the tree or a fallen branch is already decaying rather than that the fungus killed a healthy tree. Some orange bracket fungi on trunks can indicate decay inside, which is worth getting assessed.
Lichens and algae
Orange crusty or leafy patches on bark are often lichens, a partnership of fungus and algae. They are generally harmless and do not feed on the tree. A powdery orange-red coating can be an alga, which also typically does no serious harm. Lichens tend to be more visible on slow-growing or thinning trees, but they are not themselves the cause of decline.
Orange or red spots on leaves
Orange or red spots on leaves, such as the red spots people notice on apple tree leaves, are often a rust disease. Cedar-apple rust, for example, causes yellow-orange spots on apple and crabapple leaves, and it needs a nearby juniper or red cedar to complete its life cycle. Other causes of red or orange leaf spots include other fungal leaf diseases, insect feeding, and nutrient problems. Some cause only cosmetic harm, but repeated heavy infections can weaken trees and reduce fruit. If you wonder whether cedar mulch spreads rust, see cedar mulch around fruit trees.
To manage leaf rusts, rake and dispose of fallen leaves, improve air circulation by pruning, and choose resistant varieties when replanting. If you consider a fungicide, check the label and timing with your local extension office, as sprays are often applied early in the season. Sticky or discolored foliage can also come from sap-feeding insects, covered in why sticky stuff falls from trees.
Trees that drop orange seeds or berries
Not every orange dot on the ground is a disease. Several trees and shrubs produce orange or orange-red fruits or seeds, including mountain ash (rowan), some hawthorns, Oriental bittersweet, and the strawberry tree. If orange pellets are falling beneath a tree, look up for fruit clusters, and check a leaf and bark guide or ask your local extension office to confirm the species.
Should you treat it?
Most orange growths on bark, such as lichens and jelly fungi, do not need treatment. Focus on the tree’s overall condition: leaf color, growth, dieback and wounds. A tree in good health can usually live with these growths. Our guide to healthy vs unhealthy trees explains how to judge overall condition. Avoid scraping bark or applying paint or sealants to cover the area, which may cause more damage.
When to call an arborist
Get a certified arborist to look at the tree if:
- Orange bracket-like fungi are growing from the trunk or base
- Branches are dying back or the canopy is thinning
- There are cankers, oozing wounds or a hollow-sounding trunk (see holes in tree trunks)
- Fungi or mushrooms appear around the base, which can go with root rot
- You are unsure whether painted marks mean the tree is scheduled for removal