Pacific Northwest Insect Management Handbook

Common Landscape Pests

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Latest revision: 
March 2022

Includes management options for commercial and home use.

In all cases, follow the instructions on the pesticide label. The PNW Insect Management Handbook has no legal status, whereas the pesticide label is a legal document. Read the product label before making any pesticide applications.

Protect pollinators: See How to Reduce Bee Poisoning from Pesticides.

Note: Products are listed in alphabetical order and not in order of preference or superiority of pest control.

A list of the arthropod pests and pesticides for each landscape plant would be lengthy and repetitive. To conserve space, we have generated a list of common pests that can plague a range of ornamental plants, shrubs, and trees (both deciduous and coniferous) in PNW landscapes. Since this is a subset of plants found in home landscapes, the homeowner and applicator must refer to the pesticide label to determine whether any pesticide product can be legally and safely applied to specific plants in their home landscape.

Landscape pests

Kaur, N. (Ed.). 2023 Pacific Northwest Insect Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.