Rose: Thrips
Photo by: A.L. Antonelli
Biology
Thrips are tiny yellowish to dark insects that feed in flower and leaf buds.
Damaged leaves may be distorted, while infested flower buds may be distorted if they open. Heavily infested flower buds may fail to open.
Infested flowers have brown spots on the petals.
Thrips on roses are mainly an aesthetic concern.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- Encourage natural predators such as ladybird beetle larvae and lacewing larvae which help control thrips populations.
- Remove debris from around plants in fall to reduce numbers of overwintering adults.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Thrips are difficult to control.
- Make spray applications directly into the flower bud or flower.
- Follow label instructions for products applied as a drench.
- Test a bud or flower to see if the chemical can be tolerated.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
Additional Images
Photo by: A.L. Antonelli
Photo by: Unknown
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Evidence of noncompliance may be reported through your local Extension office.