How to recognize Hydrangea scale 

Young stages of Hydrangea scale are light brown and flat. Adult stages are round and more swollen. From June and July remarkable white egg sacbecome visible. There is only one generation per year in which a single female can produce up to 1000 new scales. Depending on the season, young stages can be found on the leaf, petiole or branch. Adult stages are usually found on the underside of the leaves. 

Hydrangea scale Pulvinaria hydrangeae
Hydrangea scale
Hydrangea scale Pulvinaria hydrangeae
Hydrangea scale on Hortensia

Hydrangea scale damage 

Damage by the Hydrangea scale is mainly cosmetic. During heavy infestations, large amounts of honeydew are produced. The honeydew acts as a growth medium for black sooty mold fungus which will turn the leaves black. This can hamper photosynthesis. 

Life cycle Hydrangea scale

  • 1000 eggs per female
  • young stages light brown, adult stages rounded
  • from June and July egg masses visible
  • young stages on leaf, petiole or branch
  • adult stages on underside of leaf

Host plants Hydrangea scale

  • hydrangea
  • maple
  • linden, Platanus
  • magnolia
  • viburnum
Our products against

Hydrangea scale

EXOCHOMUS QUADRIPUSTULATUS against pulvinaria scale

EXOCHOMUS
QUADRIPUSTULATUS

Effective against
– Several soft scales
– Several (woolly) aphids

COCCOPHAGUS SCUTELLARIS

Effective agains
– Many different soft scale species

Common soft scale species

Brown soft scale
Hemispherical scale
Black
scale

Horse chestnut scale
Hydrangea scale
Cottony camelia scale