Rose: Spider mites
Photo by: R.S. Byther
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
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!
- 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.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Apply to control the immature crawler stage, usually in late spring to early summer.
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 Image
Photo by: L.K. Tanigoshi
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Evidence of noncompliance may be reported through your local Extension office.