Insect of the Month - Hawthorn Lace Bug

  Hort Snacks - December 2016
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 Corythucha cydonidae

Crops Affected: Saskatoon berry and other plants in the Rose family (apples, hawthorn, pear, cotoneaster, etc.)

Life Cycle:

  • Overwinter as adults (Two generations per season)
  • Black eggs are laid in clusters on the underside of leaves in early spring
  • Nymphs emerge and feed on the underside of the leaves after about 3 weeks
  • 5 instars; 1st generation of adults emerge in midsummer, 2nd in fall
  • Feed by piercing leaves and sucking out plant juices
  • Stippled or mottled leaves with many lace bugs present
  • Feed in large numbers
  • leaves may be stained with their excrement
  • Adults are small bugs which appear to be covered in lace
  • Nymphs are dark brown to black and covered in varying amounts of spines
Hawthorn Lace bug nymph
Hawthorn Lace bug adults
Evidence of lace bugs on leaf undersides – nymphs, adults, frass and stippling of leaves
Lace bug injury on Saskatoon berry – yellowing / stippling
Severe leaf stippling and discolouration
Photos by Robert Spencer

  • Not required, but can be detected while scouting for other insect pests
  • Not typically required, as do not typically cause economic damage
    • In recent years, damage is more common and more severe on a number of different hosts – this may necessitate a need to look more closely at controls/management than in previous years
  • May be controlled during chemical applications for other registered pests
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For more information about the content of this document, contact Robert Spencer.
This information published to the web on November 30, 2016.