PestMedium Severity

Whiteflies

Tetraleurodes stanfordi

Small insects from family Aleyrodidae, related to psyllids and aphids. Not true flies despite the name. Adults have wings covered with waxy powder, while nymphs resemble scale insects after molting. Many species attack landscape plants in mild-winter areas.

Whiteflies on plant leaf underside with characteristic white waxy appearance

Identification & Symptoms

What to Look For

Leaves yellowing, shriveling, and dropping prematurely
Sticky honeydew covering leaf surfaces
Black sooty mold growth on honeydew
Plants appearing stunted, discolored and sticky
Whiteflies flying up in swarms when plant is disturbed
Groups of whiteflies on undersides of leaves

Potential Damage

Reduced photosynthesis from sooty mold
Weakened plant vigor from sap feeding
Aesthetic damage from honeydew and mold
Premature leaf drop reducing plant health
Ant attraction disrupting biological control
Plant stress predisposing to other problems

Lifecycle

Eggs are cone-shaped, standing on end on leaf undersidesYellowish initially, then gray, hatching in 2 daysSix-legged nymphs that shed legs and become rounderMolt several times, resembling scale insectsComplete development requires 3-4 weeksSeveral generations per year with all stages presentCan overwinter as eggs or nymphs

Professional Treatment Approach

1

Monitor for early detection on leaf undersides

2

Systemic insecticides for nymph and adult control

3

Horticultural oil applications during cooler weather

4

Conserve beneficial predators and parasites

5

Yellow sticky traps for monitoring and control

6

Remove heavily infested plant material

Recommended Mauget Products

Imicide

Professional-grade treatment specifically effective against whiteflies.

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Tree-äge

Professional-grade treatment specifically effective against whiteflies.

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