Pest identification
What's eating my ageratum houstonianum 'artist blue'?
Spider mites
Signs: Stippled, dull foliage with fine webbing; flower production declines as leaves bronze and drop prematurely.
Control: Neem oil or miticide spray on leaf undersides; maintain consistent soil moisture; improve air circulation around dense plantings.
Whitefly
Signs: Sticky, yellowing foliage with white insect clouds on disturbance; sooty mould may develop on honeydew.
Control: Yellow sticky traps; insecticidal soap sprays targeting leaf undersides; remove badly affected foliage.
Aphids
Signs: Colonies on new growth and flower buds; honeydew makes foliage sticky and attracts ants.
Control: Strong water jet; insecticidal soap or neem oil; beneficial insect habitat nearby to encourage natural predators.
Keep ageratum houstonianum 'artist blue' pest-free
Healthy plants resist pests best. Get the basics right:
- What eats hawaii blue flossflower — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Common ageratum houstonianum 'artist blue' problems & fixes
- Ageratum houstonianum 'Artist Blue' watering schedule
- Ageratum houstonianum 'Artist Blue' light requirements
- Full ageratum houstonianum 'artist blue' care guide
Ageratum houstonianum 'Artist Blue' pests — FAQ
What is eating my ageratum houstonianum 'artist blue'?
Ageratum 'Artist Blue' is a compact cultivar sharing the species' main vulnerabilities: spider mites, whitefly, and aphids in warm summers. Its dense, compact habit can trap humidity and favour fungal issues rather than pests, but spider mites remain the most damaging insect threat, especially in drier spells.
How do I get rid of spider mites on ageratum houstonianum 'artist blue'?
Stippled, dull foliage with fine webbing; flower production declines as leaves bronze and drop prematurely. Neem oil or miticide spray on leaf undersides; maintain consistent soil moisture; improve air circulation around dense plantings.
How do I get rid of whitefly on ageratum houstonianum 'artist blue'?
Sticky, yellowing foliage with white insect clouds on disturbance; sooty mould may develop on honeydew. Yellow sticky traps; insecticidal soap sprays targeting leaf undersides; remove badly affected foliage.
How do I get rid of aphids on ageratum houstonianum 'artist blue'?
Colonies on new growth and flower buds; honeydew makes foliage sticky and attracts ants. Strong water jet; insecticidal soap or neem oil; beneficial insect habitat nearby to encourage natural predators.