PestMedium Severity

Sycamore Lace Bug

Corythucha ciliata

Small insects with netlike wing patterns that feed on the undersides of leaves with piercing-sucking mouthparts. Adults are 3-6mm long with brown and black dotted wings, while nymphs are smaller with spines. They attack sycamore, birch, elm, and many other deciduous trees.

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Sycamore lace bug adults and nymphs feeding on leaf underside

Identification & Symptoms

What to Look For

Yellow spots on upper leaf surfaces
Gray blotched appearance on severely damaged leaves
Brown varnish-like droppings on undersides of leaves
Cast skins attached to leaves when populations are high
Leaves may turn completely brown with severe feeding

Potential Damage

Yellowing and chlorosis of leaves
Premature leaf drop
Aesthetic damage reducing plant value
Weakened plant vigor from extensive feeding
Brown spotting and discoloration

Lifecycle

Adults overwinter in bark crevices and branch crotchesSpring emergence coincides with new growthEggs attached to undersides of leaves along mid-ribsTwo generations per year typicallyGeneration completed in as few as 30 daysOn evergreens, overwinter as eggs on leaf undersides

Professional Treatment Approach

1

Monitor for early detection in spring

2

Systemic insecticides during peak nymph activity

3

Horticultural oil applications for crawlers

4

Improve plant health to resist infestations

5

Remove heavily infested branches if localized

Recommended Mauget Products

Imicide

Professional-grade treatment specifically effective against sycamore lace bug.

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Tree-äge

Professional-grade treatment specifically effective against sycamore lace bug.

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Need Professional Diagnosis?

Our certified arborists can help you accurately identify tree problems and develop an effective treatment plan using Mauget's proven injection systems.

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