European Elm Scale
Gossyparia spuria
A scale insect that feeds on elm branches, producing copious honeydew that leads to sooty mold problems. Often first noticed when honeydew becomes a nuisance on cars and outdoor furniture beneath infested trees.
Identification & Symptoms
What to Look For
Potential Damage
Lifecycle
Eggs hatch in June and July from beneath mature female scale coverings. Summer is spent as tiny, yellow nymphs on leaf undersides. Insects crawl back to branches in late summer and attach to twigs. Female scales cover themselves with gray, waxy covering and overwinter in second instar. Males overwinter in small white cocoons. In spring, females grow and become dark red-brown, producing copious honeydew. Reproduction can be sexual or asexual.
Professional Treatment Approach
Apply Imisol during crawler stage (June-July) for systemic control
Use Imicide for immediate contact kill of active scales
Apply dormant oil sprays in early spring before egg hatch
Monitor trees for crawler emergence to time treatments
Improve tree vigor with Arborfos to enhance natural resistance
Recommended Mauget Products
Imisol
Professional-grade treatment specifically effective against european elm scale.
View Product DetailsImicide
Professional-grade treatment specifically effective against european elm scale.
View Product DetailsArborfos
Professional-grade treatment specifically effective against european elm scale.
View Product DetailsNeed Professional Diagnosis?
Our certified arborists can help you accurately identify tree problems and develop an effective treatment plan using Mauget's proven injection systems.