Pest identification and confirmation—Taphrina
Blisters caused by Taphrina fungi may look similar
to those caused by the live oak erineum mite. Mites cause
blistered leaves or galled twigs and occur in yellow to orange
felty masses in depressions
on the underside of blistered leaves. No felty masses of
mites are found on the undersides of leaves infected with Taphrina spp.
However, Taphrina produces masses of pale spores on
leaf surfaces that resemble the felty mass caused by erineum
mites. Taphrina spores (asci) can occur on either
leaf surface; the felty colonies of erineum mites usually
occur only on the undersides of oak leaves. Microscopic
examination may be required to distinguish confidently between
erineum mites and Taphrina spores.
The minute eriophyid mites can barely be seen with a 10X
hand lens. A dissecting binocular microscope is required
to determine clearly whether eriophyid mites are present.
caused by the Taphrina fungus
oak erineum mite feeding damage