Whiteflies
Aleyrodidae
Sap-Sucking Insects High Risk 1-2 mm
📖 Description
Whiteflies are not true flies but are related to aphids and scale insects. They are one of the most problematic greenhouse and indoor plant pests due to their rapid reproduction and resistance to many insecticides. Both adults and nymphs feed on plant sap, causing significant damage through direct feeding and disease transmission. Whiteflies are vectors for over 100 plant viruses, making them a serious threat to food crops and ornamental plants alike.
⚠️ Symptoms to watch for
- Clouds of tiny white insects rising when plant is disturbed
- Yellowing and wilting leaves
- Sticky honeydew on leaves below infestation
- Sooty mold growing on honeydew
- Stunted growth and reduced yields
- Silver or white speckling on leaf surfaces
🩹 Treatment
- Hang yellow sticky traps to catch adults (organic)
- Release Encarsia wasps as biological control (organic)
- Spray undersides of leaves with insecticidal soap (organic)
- Apply neem oil every 5-7 days (organic)
- Use systemic imidacloprid drench (chemical)
- Apply pyrethrin spray to undersides of leaves (chemical)
🌿 Organic treatments
- Hang yellow sticky traps to catch adults
- Release Encarsia wasps as biological control
- Spray undersides of leaves with insecticidal soap
- Apply neem oil every 5-7 days
🧪 Chemical treatments
- Use systemic imidacloprid drench
- Apply pyrethrin spray to undersides of leaves
🛡️ Prevention
- Use yellow sticky traps as early detection monitors
- Keep weeds controlled around garden areas
- Inspect undersides of leaves on new purchases
- Use reflective mulch in vegetable gardens
- Encourage natural predators like lacewings and ladybugs
🪴 Affected plants
- Tomatoes
- Peppers
- Cucumbers
- Hibiscus
- Fuchsia
- Indoor Plants
- Brassicas
🦋 Natural predators
- Encarsia Wasps
- Green Lacewings
- Minute Pirate Bugs
🌱 Host plants
- Solanum lycopersicum
- Capsicum annuum
- Cucumis sativus
🔄 Lifecycle
- Females lay 150-300 eggs on leaf undersides in concentric circles.
- Eggs hatch in 5-10 days.
- Nymphs pass through 4 instar stages, with the first being a mobile crawler and the remaining stages being sessile, scale-like, and nearly invisible.
- The entire life cycle takes 18-30 days in warm conditions.
- Whiteflies reproduce continuously indoors with overlapping generations.
📅 Season
- Year-round indoors, Summer outdoors
🔎 Appearance
- Tiny, moth-like insects with white powdery wings.
- When disturbed, clouds of them rise from the undersides of leaves like white dust.
💥 Damage level
- High
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- North America
- Europe
- Asia
- Africa
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