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Grape >
Year-Round IPM Program > Identifying Spider Mites
Grape
Identifying Spider Mites and Their Damage
On this page
- Pacific spider mite
- Willamette spider mite
- Spider mite eggs
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- Pacific spider mite damage
- Willamette spider mite damage
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Because they are so similar in appearance, it is difficult to discern
between the Pacific and Willamette spider mites unless they are side-by-side.
The Pacific mite is larger in size than the Willamette spider mite. Pacific
spider mite forelegs are reddish in color, while Willamette spider
mite forelegs are translucent to pale yellow. Names link
to more information on identification and management.
Click on photos to enlarge
Spider
mites |
Pacific spider mite (adult, female)
Identification tip: The first pair of legs of this spider mite
are reddish.
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Willamette spider mite (adult, female)
Identification tip: The first pair of legs of this mite are
translucent to pale yellow.
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Spider mite eggs are tiny, translucent and spherical.
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| Damage |
Pacific spider mite
Identification tip: Pacific spider mites feed between leaf
veins leaving a round spot. This distinguishes them from Willamette
mites that feed along the veins.
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Willamette spider mite
Identification tip: Willamette spider mites characteristically
feed along leaf veins. Notice that yellowing is along the veins in
the photo above.
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Pacific spider mite
Feeds on leaves that are exposed on the sunny side of
the canopy. When populations are high they will web on shoots and leaves found
at the top. |
Willamette spider mites characteristically
feed on the shaded part of the canopy.
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