WSU Extension

Hortsense

Rose
 
Disease
Black mold 
Black spot 
Botrytis bud and twig blight 
Brand canker 
Bullheading (cold damage) 
Common canker 
Crown gall 
Downy mildew 
Powdery mildew 
Rust 
Viruses 
Insect
Leafcutting bees 
Leafrollers 
Redhumped caterpillar 
Root weevils 
Rose aphids 
Rose galls 
Rose leafhopper 
Rose midge 
Roseslug 
Spider mites 
Thrips 
Tobacco budworm 
Western spotted cucumber beetle 



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Caption: Thrips damage on basil
Photo by: A.L. Antonelli
  
Rose : Thrips
(revision date: 3/10/2017)


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


Non-Chemical Management
  • 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.
Select non-chemical management options as your first choice!

Chemical Management

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.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Bonide Captain Jack's Deadbug Brew R-T-U [Organic]
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 4-472
  • Monterey Garden Insect Spray [Organic]
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 62719-314-54705
  • Naturalis L
    Active ingredient: Beauveria bassiana  |  EPA reg no: 53871-9
  • This list may not include all products registered for this use.
Images

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Caption: Thrips damage on basil
Photo by: A.L. Antonelli
Caption: Thrips damage on pea
Photo by: A.L. Antonelli
Caption: Thrips
Photo by: Unknown