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Grape - Spider Mites

Prepared by Frank Zalom, Emily Symmes, Mark Henderson and Mark Bell, 2009 - UC Davis International Programs The most damaging spider mites in grapes include several species of the webspinning spider mites (Tetranychus spp.) such as the Twospotted spider mite (Tetranychus urticae). All of these produce webbing that is very noticeable at high densities. Other leaf feeding mites may be present that do not produce much webbing, and these are only considered damaging at much higher densities. Spider mites may be found on vines in early and mid season, but they do not typically reach damaging levels until mid season through harvest. Mites are usually pale green, to pale yellow with dark spots. The color might change somewhat depending on what plant the mite has been feeding on.

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