How to get rid of mealybugs on citrus

What mealybugs look like on citrus

Citrus mealybug (Planococcus citri) on leaf undersides, in twig forks, and around fruit calyxes; heavy honeydew and sooty mould on leaves below colonies.

For the full set of mealybugs damage symptoms across host crops, see our Mealybugs identification page.

Why citrus attracts mealybugs

Citrus mealybug takes its name from this host — citrus has been its main commercial association for over a century, and indoor citrus pots are a near-perfect environment.

Severity for this combo: High — act quickly. When to act: Year-round on indoor and conservatory citrus; warmer-season outdoors. Crawlers emerge in flushes that match the host's growth.

Step-by-step control protocol

This is the integrated-pest-management protocol — non-chemical control first, biological and organic options second, conventional sprays only as a labelled last resort. Total cycle: about three weeks for most home cases.

1. Confirm the pest. Inspect the plant — look for white cottony tufts in leaf axils, leaf undersides, and stem joints. If unsure, photograph the affected area and open Growli for instant species ID.
2. Isolate where possible. Move container-grown citrus away from healthy plants. For outdoor beds, mark the affected row so you can monitor it daily.
3. Apply non-chemical control first. Dab visible adults with a cotton swab dipped in 70 percent isopropyl alcohol
4. Add biological or organic spray. Cryptolaemus montrouzieri (mealybug destroyer) larvae are the gold-standard biocontrol for citrus mealybug. Combine with horticultural oil sprays timed to crawler emergence; Leptomastix dactylopii parasitoid wasps for severe cases.
5. Repeat on schedule. Most mealybugs protocols need repeating every 5-7 days for three weeks to catch each new hatch. A female lays 300-600 eggs in a cottony ovisac. Crawler-stage nymphs hatch wax-free and mobile — this is the only stage when contact sprays really work. Adults are protected by their wax coat.
6. Monitor and prevent recurrence. Inspect citrus weekly for the rest of the season. Quarantine new plant arrivals for 3 weeks before mixing with your collection

Best biological control for mealybugs on citrus

For greenhouse, polytunnel, conservatory, and indoor production on citrus, biological control gives long-term suppression without the residue or pollinator harm of synthetic sprays:

• Cryptolaemus montrouzieri (mealybug destroyer) — release larvae rather than adults for indoor use; adults disperse
• Leptomastix dactylopii — parasitoid wasp specific to citrus mealybug
• Chrysoperla carnea (green lacewing) larvae — generalist predator that eats mealybug crawlers

Organic spray options

Horticultural oil and insecticidal soap work best during the crawler stage, when nymphs have not yet built their wax shield — apply every 5-7 days to catch successive hatches. Neem oil disrupts moulting. Systemic insecticides are sometimes used in commercial nursery production but are not appropriate for edibles or indoor herbs.

Prevention going forward

• Dab visible adults with a cotton swab dipped in 70 percent isopropyl alcohol
• Quarantine new plant arrivals for 3 weeks before mixing with your collection
• Wash leaves and stems under lukewarm water in a sink or shower
• Prune out and bin the worst-affected stems
• Unpot suspect plants and inspect roots for white waxy root mealybug colonies

Common mistakes when treating mealybugs on citrus

• Spraying once and walking away. A female lays 300-600 eggs in a cottony ovisac. Crawler-stage nymphs hatch wax-free and mobile — this is the only stage when contact sprays really work. Adults are protected by their wax coat. A single spray misses everything that hatches afterwards — plan a 3-week protocol.
• Confusing the species. Citrus hosts several similar-looking pests. Confirm before treating; the wrong protocol wastes weeks. Open Growli for a confirmed ID.
• Spraying in midday heat. Insecticidal soap and horticultural oil burn leaves above 30 degC and on drought-stressed plants. Apply at dawn or dusk.
• Mixing biological control with broad-spectrum sprays. Pyrethroids and neonicotinoids wipe out predator releases. Use one strategy at a time.

Frequently asked questions

How do I get rid of mealybugs on citrus?

Cryptolaemus montrouzieri (mealybug destroyer) larvae are the gold-standard biocontrol for citrus mealybug. Combine with horticultural oil sprays timed to crawler emergence; Leptomastix dactylopii parasitoid wasps for severe cases. A female lays 300-600 eggs in a cottony ovisac. Crawler-stage nymphs hatch wax-free and mobile — this is the only stage when contact sprays really work. Adults are protected by their wax coat.

What do mealybugs look like on citrus?

Citrus mealybug (Planococcus citri) on leaf undersides, in twig forks, and around fruit calyxes; heavy honeydew and sooty mould on leaves below colonies.

When should I treat mealybugs on citrus?

Year-round on indoor and conservatory citrus; warmer-season outdoors. Crawlers emerge in flushes that match the host's growth.

Why are mealybugs attracted to citrus?

Citrus mealybug takes its name from this host — citrus has been its main commercial association for over a century, and indoor citrus pots are a near-perfect environment.

What is the best biological control for mealybugs on citrus?

Cryptolaemus montrouzieri (mealybug destroyer) — release larvae rather than adults for indoor use; adults disperse. Cryptolaemus montrouzieri (mealybug destroyer) larvae are the gold-standard biocontrol for citrus mealybug. Combine with horticultural oil sprays timed to crawler emergence; Leptomastix dactylopii parasitoid wasps for severe cases.

Will mealybugs on citrus spread to other plants?

Yes. Mealybugs from citrus typically migrate to nearby susceptible hosts — see the affected-crops list on the main mealybugs page. Quarantine, sticky traps, and weekly inspections of neighbouring plants are essential.

Are pesticides safe to use on citrus?

Insecticidal soap, horticultural oil, neem oil, and Bti are the safest options for edible and indoor citrus. Always read the product label and follow manufacturer's PPE, dosage, and re-entry guidance. Pesticide approvals change — confirm via the UK HSE pesticide register or US EPA before use.

Sources

Combo-specific guidance sourced from US Cooperative Extension publications (UC IPM, NC State, UMD, UMN, Penn State, CSU, UF/IFAS EDIS), Clemson HGIC fact sheets, Royal Horticultural Society guidance, and Cornell NYS IPM Biocontrol fact sheets. Reviewed by the Growli editorial team in May 2026.

Keep going

• All crops affected by mealybugs
• Mealybugs — full kill protocol (article)
• All 8 garden pests covered in this guide
• Garden pest identification — complete article