Magnolia Scale How-To Help | Platt Hill Nursery | Blog & Advice

Many gardeners are dealing with Magnolia scale feeding on their trees in their garden/landscapes. 

We can help you with how to treat your magnolias. Have additional pests or diseases contaminating your garden? 

Your Garden Problem

Magnolia scale is one of the largest scale insects in the United States. These insects damage plants by removing fluids. Heavily infested trees can be seriously injured or killed by this insect. Scale insects also secrete large amounts of honeydew, which gives the plant an unsightly sticky appearance which attracts large numbers of ants, wasps, and yellow jackets. Black sooty mold develops on the honeydew creating a dark gray film on lower leaves and plants below the tree.


Garden Rx Product Recommendations 

  • Bonide All Season Spray Oil
  • Bonide Tree and Shrub Insect Control
  • Bonide Systemic Insect Control



  • Apply Bonide All Season Spray oil in March to kill over-wintering nymphs.
  • Bonide Tree and Shrub or Systemic Insect control can be used in the summer to kill adult scale populations.


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If you are worried about fungus or pests infecting your garden, visit Platt Hill Nursery today! We can help troubleshoot any pest issues you’re having so that you can enjoy your plants without worry. 


Platt Hill Nursery es el principal centro de jardinería y vivero de Chicago.