Adult- About 1.5 mm long, the adult is light yellow with the antennae and legs slightly lighter incolor. Most of the body is covered with a white, waxy bloom. The eyes appear dark brown. Asusual, the small moth-like adults fly about readily when infested plants are disturbed.
Egg- Azalea whitefly eggs are typical of other whiteflies in their irregular cylindrical shape that issomewhat pointed at one end and rounded at the other (base end). The base end has a tinyprotuberance that is inserted into the leaf tissue. The eggs are 0.1 mm wide and 0.22 mm long.Color ranges from translucent creamy to dark gray tipped fading to paler gray at the base.
Nymph- The tiny nymphs, are oval and light in color without any form of wax secretions.
Pupa- The pupal case is light yellow to an orange yellow in color, without any form of waxsecretions and about 0.84 mm long. The marginal areas appear lighter in color than the mid-dorsalarea. Some marginal indentations may be present when the pupal case has grown against the leafhairs.
Fig. 174: Azalea whitefly, Pealius azaleae (Baker & Moles), Aleyrodidae, HOMOPTERA
A, Adult, B, Egg. C, Crawler. D, Pupa. Pupal case without large dorsal setae, even if leaves are hairy.
Distribution- This whitefly has been spread worldwide wherever azaleas grow. The first records inthe United States were on plants received from Holland in 1910. Without a doubt azalea whitefliesoccur in all southeastern states.
Host Plants- Azalea whiteflies infest all species of azaleas.
Damage- Infested plants become unthrifty, honeydew, and sooty mold detract from a healthyappearance. Unless controlled, large clouds of whiteflies take to the air when heavily infestedplants are disturbed.
Life History- Little is known about this whitefly and its life cycle. Presumably it is very similar to other whitefly species. This whitefly overwinters as nymphs on azalea leaves. Adults emerge in early spring in North Carolina and lay eggs on the undersides of azalea leaves. The eggs are creamy and translucent, but turn gray as they age.
For specific chemical controls see your County Cooperative Extension publications on ornamental plant pests.
University of Florida/IFAS Reference to Pest Control Guides