Whitefly

Description

Whitefly set up home and live out their lives on the underside of leaves. As adults they are about 2mm long with white wings, which give them their name. The adults lay eggs which hatch into yellowy green scale-like nymphs which become pupae before reaching adulthood. Three generations living under the same leaf and all of them feeding on the sap of the plant.

Symptoms

In the garden, Whitefly are fond of Azaleas, Rhododendron, Honeysuckle – not forgetting Cabbages. Indoors, in the conservatory or in the greenhouse they’re less picky and will feed on many houseplants, ornamentals and vegetables. There’s usually little visible damage to the plants themselves, but brush past an infested plant or close the greenhouse door sharply and you’ll see a ‘white cloud’ rise from the underneath the leaves. If the infestation is left untreated things change.

They feed on sap and they excrete a sticky honeydew which drops on to lower foliage. A black sooty mould develops. Very unsightly. Whitefly can also spread viruses.

Treatment and control

Spray fruit & vegetables with a natural insecticide

Pyrethrin based insecticides will control Whitefly and other plant pests. An example is Nature's Answer Natural Fungus & Bug Killer. For best results spray thoroughly as Pyrethrins kill on contact.

Spray ornamentals with a systemic insecticide

For treatment of ornamental plants only, spray with a systemic insecticide. Examples are BugClear Ultra Concentrate for Flowering Plants and BugClear Ultra Gun! for Flowering Plants

Greenhouses and conservatories

In greenhouses and conservatories ‘sticky’ traps can help control.

Always read the label. Use pesticides safely.

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