Davey - TCOT

Lace Bugs

There are many species of lace bugs, some infecting deciduous plants while others infect evergreens. 

Tree Symptoms 

Infested leaves will have a whitish flecked damage called stippling. Large populations of lace bugs cause premature leaf drop and weaken plants by removing nutrients from their leaves. To pinpoint lace bug activity, look for blackish, shiny droplets of lace bug excrement on the bottom of the leaf.

 Host Plants 

  • Deciduous plants: cotoneaster, hawthorn, oak, pyracantha, quince and sycamore 
  • Evergreen plants: azalea, mountain-laurel, pieris and rhododendron 

A group of baby lace bugs looks like a dark smudge on the leaf, but can be identified with closer observation. 

Treatment and Management 

Monitor leaves in late May at three-to-four-week intervals. An insecticide application may be necessary from late may through mid-August. When planting a tree, choose a shady, cooler site where naturally occurring fungal diseases will attack lace bugs and reduce their population. 

Contact your local arborist using the form below to schedule a tree inspection and determine the best treatment for your landscape.

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