WSU Extension

Hortsense

Caption: Aphid colony
Photo by: A.L. Antonelli
  
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Photinia : Aphids
(revision date: 2/14/2019)


Biology
Aphids on photinia are variously colored, from yellowish or greenish to black. They are soft-bodied insects less than 1/8" long. Aphids often feed in large groups and typically are found on new growth, including both leaves and shoots. Heavy infestations can cause yellowing or wilting of foliage. New growth may be stunted. Aphids often produce honeydew, a sweet, sticky material that may attract ants or become covered with a growth of dark sooty mold.
Management Options

Non-Chemical Management
  • Hand-wipe or prune to control small, localized infestations (when practical).
  • Wash aphids from foliage with a strong stream of water.
  • Encourage natural enemies of aphids including ladybird beetles, lacewings, syrphid fly larvae, and parasitic wasps. Avoid use of broad-spectrum insecticides which kill these beneficial insects.
  • Control honeydew-feeding ants, which may protect aphid colonies from predators.
  • Provide proper nutrition. High levels of nitrogen in the foliage encourage aphid reproduction. Switch to a slow-release or low-nitrogen fertilizer.
Select non-chemical management options as your first choice!

Chemical Management


Apply when aphids or damage is first noticed. Apply oils in delayed dormant period to kill overwintering eggs. 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
  • Bonide Systemic Insect Control
    Active ingredient: acephate  |  EPA reg no: 239-2461-4
  • 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 Garden Defense Multi-Purpose Spray Conc [Organic]
    Active ingredient: clarified hydrophobic extract of neem oil  |  EPA reg no: 70051-2-42697
  • 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: Aphid colony
Photo by: A.L. Antonelli
Caption: Aphid cast skins
Photo by: R.S. Byther