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Lilly Pilly Pests & Diseases

Identify and treat common lilly pilly problems — psyllid, myrtle rust, scale, sooty mould, and more — with Australian-relevant advice for home gardeners.

Quick take

  • • Psyllid causes bubbly leaf pimples
  • • Myrtle rust shows yellow-orange pustules
  • • AU scene: In coastal gardens, protect lilly pilly from strong wind and salt spray with a sheltered position and regular mulch
  • • Scale and sooty mould can occur
  • • Prevention is easier than cure

Quick Answer: Monitor and Act Early

The most common lilly pilly problems are psyllid (leaf pimples) and myrtle rust (yellow-orange pustules). Both are most active in warm, humid conditions. Early detection and prompt action — removing affected growth and improving airflow — are key to management.

What to do: Regularly inspect new growth during spring and summer. Remove and dispose of affected material immediately. Avoid over-fertilising and overhead watering to prevent problems.

Troubleshooting Common Problems

Identify the issue, understand the likely causes, and follow the fix steps.

Psyllid (Pimple Psyllid)

What you see

Psyllid (Pimple Psyllid)

Likely causes (top 3)

  • 1.Small insect infestation on new leaves
  • 2.Most active in spring–summer
  • 3.Causes bubbly bumps and distortion

Fix steps

  1. 1.Remove and dispose of affected growth
  2. 2.Encourage beneficial insects (ladybirds, lacewings)
  3. 3.For severe cases: horticultural oil or pest control, following label instructions

Escalate if: More than 30% of new growth affected, Plant health visibly declining

Photo checklist: Take clear photos of the affected area, overall plant health, and growing conditions. This helps with diagnosis if you need to consult a local nursery.

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Myrtle Rust

Myrtle rust is a fungal disease showing as yellow-orange pustules on new growth. It spreads in warm, humid conditions and can cause defoliation.

  • Signs: Yellow-orange pustules on leaves, stems, and fruit
  • Conditions: Warm, humid weather
  • Prevention: Avoid overhead watering, improve airflow

Compare: Healthy vs Issue

Visual comparison helps identify problems early.

Leaf Health

Healthy

Smooth, glossy leaves with even green colour

Issue

Bubbly bumps (psyllid) or yellow-orange pustules (myrtle rust)

Images are representative. Always consult a local expert for confirmation.

Frequently Asked Questions

Quick answers to common lilly pilly questions

Psyllid (also called pimple psyllid) is a small sap-sucking insect that causes distinctive bubbly bumps on new lilly pilly leaves. Most active in spring–summer.

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