How to get rid of whitefly on peppers

What whitefly look like on peppers

Silverleaf whitefly (Bemisia tabaci) and greenhouse whitefly on pepper undersides; honeydew, sooty mould, and irregular fruit ripening from heavy nymph feeding.

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

Why peppers attracts whitefly

Peppers are a documented host for both whitefly species commonly attacking horticultural greenhouses; pepper transplants are also a common source of accidental whitefly imports between sites.

Severity for this combo: Moderate — monitor closely. When to act: Greenhouse peppers: from transplant. Outdoor peppers: mid-to-late summer once flying adults arrive.

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 cloud of tiny moth-like adults rising when leaves are disturbed. If unsure, photograph the affected area and open Growli for instant species ID.
2. Isolate where possible. Move container-grown peppers away from healthy plants. For outdoor beds, mark the affected row so you can monitor it daily.
3. Apply non-chemical control first. Yellow sticky traps at canopy height — catch adults before they lay
4. Add biological or organic spray. Eretmocerus eremicus parasitoid wasp (better than Encarsia for Bemisia), yellow sticky traps, and insecticidal soap on nymph-heavy lower leaves. Silver reflective mulch on outdoor beds.
5. Repeat on schedule. Most whitefly protocols need repeating every 5-7 days for three weeks to catch each new hatch. Eggs to adults in about 3-4 weeks at 21-26 degC. Adults lay eggs on the youngest leaves; nymphs (scale-like) fix to one spot and feed for the rest of their development. Targeting nymphs is more effective than chasing adults.
6. Monitor and prevent recurrence. Inspect peppers weekly for the rest of the season. Silver reflective mulch around the base of plants — confuses incoming whiteflies

Best biological control for whitefly on peppers

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

• Encarsia formosa — parasitoid wasp, the standard agent for greenhouse whitefly on tomatoes and cucumbers (1 wasp per 4 plants, biweekly)
• Eretmocerus eremicus — better for silverleaf whitefly (Bemisia) in warmer conditions
• Delphastus catalinae — small black ladybird that eats whitefly eggs
• Macrolophus pygmaeus — predatory bug used in long-cycle greenhouse tomato

Organic spray options

Insecticidal soap and horticultural oil target nymphs on leaf undersides — repeat every 5-7 days because nymphs molt under a waxy shield. Spinosad and pyrethrin are stronger options; both are toxic to bees, so spray at dusk after pollinators have left. Avoid neonicotinoid drenches on flowering crops.

Prevention going forward

• Yellow sticky traps at canopy height — catch adults before they lay
• Silver reflective mulch around the base of plants — confuses incoming whiteflies
• Vacuum adults from foliage in early morning when cold and slow
• Remove and bin the lowest leaves where most nymphs settle
• Inspect transplants before bringing them home — most outbreaks start with one infested seedling

Common mistakes when treating whitefly on peppers

• Spraying once and walking away. Eggs to adults in about 3-4 weeks at 21-26 degC. Adults lay eggs on the youngest leaves; nymphs (scale-like) fix to one spot and feed for the rest of their development. Targeting nymphs is more effective than chasing adults. A single spray misses everything that hatches afterwards — plan a 3-week protocol.
• Confusing the species. Peppers 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 whitefly on peppers?

Eretmocerus eremicus parasitoid wasp (better than Encarsia for Bemisia), yellow sticky traps, and insecticidal soap on nymph-heavy lower leaves. Silver reflective mulch on outdoor beds. Eggs to adults in about 3-4 weeks at 21-26 degC. Adults lay eggs on the youngest leaves; nymphs (scale-like) fix to one spot and feed for the rest of their development. Targeting nymphs is more effective than chasing adults.

What do whitefly look like on peppers?

Silverleaf whitefly (Bemisia tabaci) and greenhouse whitefly on pepper undersides; honeydew, sooty mould, and irregular fruit ripening from heavy nymph feeding.

When should I treat whitefly on peppers?

Greenhouse peppers: from transplant. Outdoor peppers: mid-to-late summer once flying adults arrive.

Why are whitefly attracted to peppers?

Peppers are a documented host for both whitefly species commonly attacking horticultural greenhouses; pepper transplants are also a common source of accidental whitefly imports between sites.

What is the best biological control for whitefly on peppers?

Encarsia formosa — parasitoid wasp, the standard agent for greenhouse whitefly on tomatoes and cucumbers (1 wasp per 4 plants, biweekly). Eretmocerus eremicus parasitoid wasp (better than Encarsia for Bemisia), yellow sticky traps, and insecticidal soap on nymph-heavy lower leaves. Silver reflective mulch on outdoor beds.

Will whitefly on peppers spread to other plants?

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

Are pesticides safe to use on peppers?

Insecticidal soap, horticultural oil, neem oil, and Bti are the safest options for edible and indoor peppers. 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 whitefly
• How to grow peppers — full guide
• Peppers plant-care reference
• Peppers companion plants
• All 8 garden pests covered in this guide
• Garden pest identification — complete article