My Lemon Tree, which has been in the conservatory through last winter and is still there, has developed a sticky substance on the leaves that then drops on to the floor. Is this anything to worry about and how can it be treated?

It sounds like the tree has either aphids or scale insects feeding on the plant. Look on the under sides of the leaves. The aphids or scale insects will be there. These can be treated with an insecticide.




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