WSU Extension

Hortsense

Caption: Gladiolus thrips damage
Photo by: R.S. Byther
  
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Gladiolus : Thrips
(revision date: 3/10/2017)


Biology
Gladiolus thrips are tiny insects with feather-like wings, an unusual design in the insect world. They have rasping mouthparts that cause feeding damage characterized as elongated stippling on leaves and flowers, eventually making plant materials appear washed out. Once thrips get into the flowers, they are nearly impossible to control.
Management Options

Non-Chemical Management
  • Inspect corms carefully for thrips before purchase.
  • Wash corms vigorously over a drain, if thrips are found.
  • Discard and destroy brown and corky corms.
  • Preserve natural enemies, such as predatory mites, lacewings, and pirate bugs.
Select non-chemical management options as your first choice!

Chemical Management


Carefully read and follow label instructions.

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
  • Bonide Systemic Insect Control
    Active ingredient: acephate  |  EPA reg no: 239-2461-4
  • Bull's-Eye Bioinsecticide
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 62719-314-56872
  • This list may not include all products registered for this use.
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Caption: Gladiolus thrips damage
Photo by: R.S. Byther
Caption: Thrips
Photo by: Unknown