Pocket Botanist
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Check these first
- Inspect the undersides of the leaves for tiny insects.
- Touch the leaves to feel for a sticky residue.
- Look for ants, which often farm aphids.
Likely causes
Aphid infestation
Most likelyHow to tell: You will see tiny green or black insects on the undersides of leaves and a sticky residue on the foliage below.
What to do: Spray the leaves with a strong stream of water from your garden hose to knock them off. If they persist, apply insecticidal soap once a week for 3 weeks.
Sooty mold
PossibleHow to tell: A black, powdery coating appears on the leaves after an aphid infestation.
What to do: Wash the leaves with a gentle soap solution to remove the mold. Focus on controlling the aphids first, as the mold will disappear once the honeydew stops.
Find out what's wrong with your linden tree
The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
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When to worry
A few aphids are normal, but if the entire tree is covered in sticky honeydew and black mold, it needs treatment. Healthy trees can usually handle minor infestations without long term damage.
Stopping it coming back
Encourage natural predators like ladybugs in your garden. Avoid heavy nitrogen fertilizers that encourage soft, succulent growth that aphids love.
Linden tree: pests? Check yours with a photo
Every plant is a little different. Take a photo of your linden tree and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Will aphids kill my Linden tree?
- Usually no. While they are annoying, they rarely kill a mature, healthy tree.
- Is the sticky stuff harmful to my car parked underneath?
- Yes, it can be quite messy. It is best to park elsewhere if your tree is currently hosting a large aphid colony.
Guides to these causes
More problems with Linden tree
This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.