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Spider Mites

FAST FACTS - Spider Mites
by Nanette Londeree, Master Rosarian

SIGNS

  • Eight legged, oval shaped adults ranging in color from red and brown to yellow and green depending on the species and the season, particularly June through September

    Bronzing of Leaves SYMPTOMS

  • Stippling or yellowing of leaves; leaves look gray or dry
  • Leaves turn yellow and drop off
  • Webbing on undersides of leaves
  • Eggs on undersides of leaves

    CAUSE

  • Species in the Tetranychus genus - the two-spotted spider mite and the Pacific spider mite

    OPTIMAL CONDITIONS

  • Low rainfall areas
  • Warm summer temperatures above 70F
  • Dry plant foliage
  • Dust and dirt on leaf surfaces

    Spider Mites - webbing TREATMENT

    Prevention:

  • Maintain good garden sanitation
  • Remove fallen leaves, branches or fruit, as well as weeds that may serve as a host
  • Periodic hosing of plants with a forceful jet of water, including the undersides of leaves

    Elimination:

  • Use selective materials, preferably insecticidal soap, horticultural oil or neem oil
  • Use a miticide or acaricide, such as Akari, Avid, Floramite or Forbid - available from http://www.rosemania.com/

    GOOD GUY / BAD GUY?

  • A really bad guy, especially in dry weather when a plant can be completely defoliated in a matter of days


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    Last Modified: 08/06/2013