WSU Extension

Hortsense

Caption: Spider mite damage on rose
Photo by: R.S. Byther
  
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Rose : Spider mites
(revision date: 3/10/2017)


Biology
Spider mites are tiny, eight-legged, and yellowish to brown in color. They cause mild to severe stippling (little specks or dots) on leaves. Usually yellowish to bronze in color, stippling can, in severe cases, cause leaves to drop. Fine webbing is often present, especially on the underside of leaves. Mites may be found on either leaf surface, but normally on the underside of leaves.
Management Options

Non-Chemical Management
  • Predaceous mites and insects such as ladybird beetles may naturally control spider mite levels. Avoid use of broad-spectrum insecticides that kill these natural predators.
  • Wash spider mites from plants with a strong stream of water.
  • Keep plants healthy to increase pest tolerance.
  • Switch to slow-release or lower-nitrogen fertilizers. High levels of nitrogen in the leaves can increase spider mite reproduction rates.
Select non-chemical management options as your first choice!

Chemical Management


Apply to control the immature crawler stage, usually in late spring to early summer.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Safer Brand Insect Killing Soap Conc II [Organic]
    Active ingredient: potassium laurate  |  EPA reg no: 42697-60
  • This list may not include all products registered for this use.
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Caption: Spider mite damage on rose
Photo by: R.S. Byther
Caption: Spider mites under microscope
Photo by: L.K. Tanigoshi