How to Identify Common Flower Pests and Solutions

Quick answer: The bugs you are most likely to find on or inside flowers are aphids, thrips, whitefly, mealybugs, scale insects, spider mites, caterpillars, and slugs and snails. Most can be controlled without harsh chemicals: hose them off, remove damaged growth, and treat with insecticidal soap or neem oil every 5 to 7 days until they are gone.

Whether you grow your own flowers or have just brought home a bouquet, this guide shows you how to identify each common flower pest, what damage it causes, and the simplest fix, with notes for the warm, humid Sunshine Coast climate.

What are the most common flower pests?

Eight pests cause most of the damage to garden flowers in South East Queensland. Use this table to match what you are seeing to the likely culprit.

Pest	What it looks like	Where you will find it	Tell-tale damage	First fix to try
Aphids	Tiny soft green, black or pink insects in clusters	New shoots, buds, undersides of leaves	Curled or yellow leaves, sticky honeydew, ants	Hose off, then insecticidal soap
Thrips	Very thin, fast moving, about 1 to 2 mm long	Inside open flowers and buds	Silver streaks and brown scarring on petals, buds that fail to open	Remove damaged blooms, neem oil
Whitefly	Tiny white moth-like insects that fly up when disturbed	Undersides of leaves	Yellowing, wilting, sticky leaves	Yellow sticky traps, insecticidal soap
Mealybugs	White, cotton wool like clumps	Stems, leaf joints, buds	Yellowing and stunted growth	Cotton bud dipped in rubbing alcohol
Scale insects	Small round or oval bumps that do not move	Stems and along leaf veins	Yellowing, leaf drop, sooty mould	Wipe off, then horticultural oil
Spider mites	Barely visible dots with fine webbing	Undersides of leaves in hot, dry weather	Speckled, dull or bronzed leaves	Strong spray of water, raise humidity
Caterpillars	Soft green or brown larvae	Leaves and petals, often at night	Large chewed holes, droppings	Hand pick, or a Bt based spray
Slugs and snails	Slimy, with silver trails	Low, damp, shady spots after rain	Irregular holes in leaves and petals	Hand pick at night, beer traps

What are the tiny bugs inside my flowers?

If the bugs are inside the flower itself, they are almost always thrips. Thrips are slender insects about 1 to 2 mm long that hide between petals and feed on them, leaving silver streaks and brown edges. Tap the flower over a sheet of white paper: if tiny dark slivers drop out and start moving, you have thrips. Pollen beetles and small ants also visit flowers but do little damage.

Why are there bugs on my cut flowers or bouquet?

A few tiny insects on fresh cut flowers are normal, because flowers grown outdoors are visited by insects right up until harvest. They are harmless to people and to your home. Gently shake the bouquet outdoors, trim the stems, and refresh the water. If you have any questions about flowers from our shop, get in touch.

What is eating holes in my flowers?

Large, irregular holes usually mean caterpillars or slugs and snails. Check at night with a torch: caterpillars sit on the leaves and petals, while slugs and snails leave shiny trails. Small pin holes or scarring on petals point to thrips or beetles instead.

How do you identify and treat each flower pest?

Aphids

Aphids are small, soft bodied insects that cluster on new shoots, buds and the undersides of leaves. They suck sap, which causes curled, yellowing leaves and stunted growth, and they leave sticky honeydew that attracts ants and sooty mould.

Fix: Blast them off with the hose, then spray with insecticidal soap or neem oil. A mild mix of water and a few drops of dish soap also works. Ladybirds and lacewings eat aphids, so avoid broad spectrum sprays that kill them.

Whitefly

Whitefly look like tiny white moths and rise in a cloud when you brush the plant. They feed on the undersides of leaves, cause yellowing and wilting, and can spread plant viruses.

Fix: Hang yellow sticky traps to catch the adults and treat the undersides of leaves with insecticidal soap or neem oil. Lacewing larvae are a good natural predator for heavy infestations.

Spider mites

Spider mites are tiny arachnids that are hard to see without a magnifying glass. The clues are fine webbing and speckled, dull or bronzed leaves. They love hot, dry conditions, so they are worst during dry spells and on plants under eaves.

Fix: Spray the undersides of leaves with a strong stream of water and raise the humidity around the plant. Neem oil or a registered miticide will treat a heavy infestation. Check for new webbing each week.

Thrips

Thrips are slender, winged insects that feed on petals, causing streaks, scars and distorted flowers. They also spread plant viruses.

Fix: Remove and bin damaged flowers and buds. Treat with neem oil or insecticidal soap, and use blue or yellow sticky traps to catch flying adults.

Caterpillars

Caterpillars are the larvae of moths and butterflies and can strip a plant of leaves and petals quickly.

Fix: Hand pick them off, or use an organic spray based on Bacillus thuringiensis (Bt), which only affects caterpillars. Birds are great natural control, so a bird friendly garden helps.

Mealybugs

Mealybugs are covered in white, cotton wool like wax and gather on stems, buds and leaf joints, where they feed on sap and cause yellowing and stunted growth.

Fix: Dab each one with a cotton bud dipped in rubbing alcohol. For larger outbreaks, spray a diluted alcohol and water mix, insecticidal soap or neem oil. Test any spray on a small area first.

Slugs and snails

Slugs and snails chew large, irregular holes in leaves and flowers. They feed at night and hide in damp, shady spots.

Fix: Collect them by hand at night, set shallow beer traps, or sprinkle a barrier of diatomaceous earth around plants. Frogs, lizards and birds all help keep them in check.

Scale insects

Scale looks like small round or oval bumps that do not move. They feed on sap, which leads to yellowing, leaf drop and sooty mould from their honeydew.

Fix: Wipe or scrape them off with a cotton ball soaked in rubbing alcohol, then spray with horticultural oil or neem oil to smother any you missed. Severe cases may need an insecticide labelled for scale.

What is the orange powder on my frangipani leaves?

Orange, powdery spots under frangipani (plumeria) leaves are frangipani rust, a fungal disease that is common across Queensland in humid late summer and autumn. It is not an insect. Rake up and bin fallen leaves rather than composting them, improve air flow around the tree, and remove badly affected leaves. Frangipanis usually recover and reshoot in spring.

How do you stop pests coming back?

• Check weekly. Look under leaves and inside buds. Early action stops small problems becoming big ones.
• Grow healthy plants. Good soil, the right amount of sun and deep, less frequent watering make plants more resistant. Overwatering stresses plants.
• Keep it clean. Remove dead leaves, spent flowers and debris where pests hide and breed.
• Invite the good bugs. Ladybirds, lacewings, hoverflies and predatory mites do pest control for free. Flowering herbs attract them.
• Choose gentle treatments first. Water sprays, insecticidal soap, neem oil and diatomaceous earth protect the beneficial insects that chemicals would kill.

Flower pest FAQs

Do flower bugs hurt people or pets?

No. The common flower pests in this guide feed on plants, not people or pets. Ants that follow aphids can nip, and caterpillar hairs can irritate sensitive skin, so wear gloves when hand picking.

Is neem oil safe to use on flowers?

Yes, when it is diluted as the label directs. Spray in the early morning or late afternoon, not in full sun, and test a few leaves first because some delicate petals can mark.

Do dead flowers attract bugs?

Yes. Spent flowers and fallen petals give pests, fungus and slugs somewhere to hide and breed. Deadhead regularly and clear debris from around your plants.

When are flower pests worst on the Sunshine Coast?

Aphids, whitefly, mealybugs and scale build up in the warm, humid months from spring through to autumn. Spider mites peak in hot, dry spells, and slugs and snails are most active after rain.

Leave the flowers to us

Every bouquet and arrangement from Buderim Floral Art is made by hand in our Buderim shop. Browse our bestselling flowers, pick up an easy care indoor plant, or read our guide to keeping flowers fresh in sunny climates. We deliver same day across the Sunshine Coast when you order before 2pm on weekdays or 10am on Saturday.

Last updated 28 September 2026 by the Buderim Floral Art team.