Azalea Lace Bug

What it does

Both adults and nymphs feed on the underside of leaves, piercing the tissue and sucking sap. This removes chlorophyll and produces a coarse, silvery-white stippling on the upper leaf surface that can make an azalea look sun-bleached or drought-stressed. The undersides collect shiny black, tar-like fecal specks and shed skins, a telltale sign.

Where it lives

The azalea lace bug is found wherever azaleas and rhododendrons are grown, and is especially damaging in the Southeast and along the East Coast, as well as in the Pacific Northwest and other regions. Plants in full sun and warm, exposed sites typically suffer heavier infestations than those in shade.

How it breeds

Females insert eggs into leaf tissue along the midrib on the underside, often covering them with a brown varnish-like material. Nymphs pass through several spiny stages before maturing. Multiple generations occur each year, up to four or more in warm regions, allowing populations to build steadily through the growing season.

What it eats

Azalea lace bugs feed on the sap of evergreen and deciduous azaleas and rhododendrons. They are host-specialists and do not move onto unrelated garden plants.

Identification

Adults are small, about 3-4 mm, with flattened, transparent, intricately veined 'lacy' wings held over a brown-black body. Nymphs are smaller, dark, and spiny. The clearest field signs are the silvery stippled upper leaf surface and the dark tar-like spots and cast skins on the leaf underside.

Signs of an infestation

• Coarse silvery-white stippling on the upper leaf surface
• Shiny black, tar-like fecal spots on leaf undersides
• Cast (shed) skins clinging to the underside of leaves
• Tiny lacy-winged adults and spiny dark nymphs beneath leaves
• Overall bleached, drought-stressed look to the shrub

Prevention tips

• Check leaf undersides in spring for early nymphs and the first generation
• Site azaleas in part shade, since sun-stressed plants are hit harder
• Rinse undersides with a strong water spray to dislodge lace bugs
• Keep plants healthy and watered to reduce feeding stress
• Encourage natural predators by avoiding broad-spectrum sprays

Professional solutions

Early treatment of the first generation with insecticidal soap or horticultural oil, applied to leaf undersides, gives the best control for gardeners. Systemic products exist for heavy infestations but should be used carefully near flowering plants. Your Cooperative Extension office can advise on timing and pollinator-safe options if damage is severe.