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090616_085_Pear leaf blister mite.jpg
Pear leaf blister mite damage on underside of leaf. Microscopic mites (Eriophyes pyri) live within  the tissue of the tree's leaves, releasing a damaging toxin as they feed. Initially, pink or yellow-green blisters appear on the leaves, either side of the central rib. These turn darker as the summer progresses.