Cottony hydrangea scale

Pulvinaria hydrangeae 

Recognizing cottony hydrangea scale:
young stages are light and pretty flat. Adult stages are round and more swollen. From June / July striking white egg masses become visible. There is only one generation per year. A single female scale insect can produce up to1,000 offspring. Young stages can be found on leaf, petiole or branch, depending on the season.  Adult stages are mostly found on the underside of leaves.

Damage cottony hydrangea scale: 
Cottony hydrangea scale causes mainly cosmetic damage. At heavy infestations a huge amount of honeydew will be produced by the scales. In this honeydew the black sooty mould fungus starts growing which causes leaves to turn black. 

lifecycle cottony hydrangea scale:

  • young stages bright in color
  • adult stages round, brown
  • from June / July the striking white egg masses become visible
  • about 1,000 eggs per female
  • young stages on leaf, petiole or branch, depending on season
  • adult stages on the trunk

host plants cottony hydrangea scale:

  • maple
  • hydrangea
  • lime tree
  • magnolia
  • plane tree
  • viburnum


Exochomus quadripustulatus:

E. quadripustulatus

Coccophagus scutellaris:

C. scutellaris