WSU Extension

Hortsense

Dogwood
 
Disease
Anthracnose 
Armillaria root rot 
Collar rot 
Leaf scorch and leaf roll 
Powdery mildew 
Insect
Brown soft scale 
Lecanium scale 
Oystershell scale 



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Caption: Brown soft scales
Photo by: A.L. Antonelli
  
Dogwood : Brown soft scale
(revision date: 2/14/2019)


Biology
Brown soft scales are yellowish to dark brown (adults are usually darker). They are found mainly on twigs, although young scales may also be found on foliage. They overwinter as immatures on host.
Management Options


Non-Chemical Management
  • Ladybird beetles and parasitic wasps help control scale populations.
  • Minor infestations may be picked off by hand.
  • Where practical, prune and destroy heavily infested branches.
Select non-chemical management options as your first choice!

Chemical Management

Scout for crawlers. Insecticide applications can be effective when applied to control the immature crawlers stage, usually in late spring to early summer. Oils are effective in the delayed dormant period. Use superior type oil sprays only on overwintering nymphs. Homeowners should not make foliar applications to trees over 10 ft tall. Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • All Seasons Horticultural & Dormant Spray Oil Conc [Organic]
    Active ingredient: oil/pet distillate  |  EPA reg no: 4-80
  • Hi-Yield Dormant Spray
    Active ingredient: oil/pet distillate  |  EPA reg no: 7401-428
  • Safer Brand BioNEEM Multi-Purpose Insecticide & Repellent Conc [Organic]
    Active ingredient: azadirachtin  |  EPA reg no: 70051-6-42697
  • Safer Brand Insect Killing Soap Conc II [Organic]
    Active ingredient: potassium laurate  |  EPA reg no: 42697-60
  • This list may not include all products registered for this use.
Images

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Caption: Brown soft scales
Photo by: A.L. Antonelli