Whiteflies: Identification, Control & Prevention

Whiteflies (Aleyrodidae) are tiny, winged, soft-bodied insects related to aphids. 1/12" long, triangular, clustered on leaf undersides. Active daytime; camouflaged. Overwinter/reproduce year-round in warm climates. Silverleaf whitefly (smaller, yellower) common in Southeast. Infest ornamentals and warm-season vegetables: tomatoes, eggplant, peppers, okra, sweet potatoes, brassicas. Peak mid-late summer; greenhouse pest.

Identification

Suck plant juices → sticky honeydew → fungal diseases. Plants weaken, can't photosynthesize → wilt, pale/yellow, stunted. Honeydew attracts ants. Check leaf undersides near veins; feel for honeydew. Disturbed clouds fly up in swarms. Eggs: pale yellow → brown, circular pattern on undersides. Females lay up to 400; hatch 1 week–1 month. Larvae: immobile white ovals, immediate feeding.

Control

Start early! Morning/evening checks for eggs/fly-aways.

• Blast with hose → scatter. Then spray insecticidal soap thoroughly (undersides!). Cool temps only (late day). Repeat 2–3x.
• Homemade: Palmolive lemon + water (good squirt/gal). Cool temps only. Benign but persistent—combine with prevention.
• Handheld vacuum every few days removes nymphs/larvae.

Prevention

• Encourage predators: ladybugs, spiders, lacewings, dragonflies, hummingbirds. Create habitat for dragonflies/damselflies (eat mosquitoes too).
• Avoid chemical insecticides—whiteflies resistant; kills beneficials and pollinators.
• Aluminum reflective mulch early season (especially tomatoes/peppers)—disorients whiteflies.
• Yellow sticky traps: petroleum jelly (+ dish soap) on yellow boards/cards. Yellow mimics new foliage; bugs stick and die.