Marin Rose Society

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 70°F

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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FAST FACTS - Spider Mites by Nanette Londeree, Master Rosarian

FAST FACTS - Spider Mites
by Nanette Londeree, Master Rosarian