Lemon Tree Pests
The main pests of Lemons are scale insects. Less occasionally, aphids, mites, and mealy bugs can be present. They result in yellow leaves that often have a mottled appearance. Where such pests are present there will often be a black mould on some of the leaves and stems. This is a mould that feeds on the sugars released from the plant by these insects feeding. While the mould is unsightly, it does not hurt the plant and will dissipate with time. All these pests are easily controlled with a general insecticide. Please always read the label before using any agrichemical.