A brown or distorted Lilly Pilly hedge is a common sight in Sydney. The usual culprit is Lilly Pilly psyllid, but drainage, scale and root issues can also cause discolouration.
Lilly Pilly hedges are usually lush and green, so brown leaves are a clear sign something is wrong. The most common cause in Sydney is Lilly Pilly psyllid, a tiny sap-sucking insect whose larvae live inside the leaves and create raised, pimple-like galls. The galls distort the foliage and can make whole sections look bronze, red or brown.
Scale insects and sooty mould are another frequent problem. Scale feed on the sap and excrete a sticky honeydew that grows black sooty mould, blocking light and weakening the plant. Affected leaves often turn yellow then brown and may drop early.
Environmental stress can also cause browning. Poor drainage, compacted soil, root damage from nearby construction or prolonged drought can all show up as brown leaf tips, branch dieback or a thin, patchy canopy.
Treatment depends on the cause. Psyllid and scale can be controlled with targeted sprays and good hedge hygiene. For root or drainage issues, improving soil conditions, mulching and adjusting irrigation is usually more important than spraying. A professional inspection can identify the cause quickly and stop the hedge from declining further.
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