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Pests, diseases & disorders

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090905_019_Pear leaf blister mite.jpg
Pear leaf blister mite late in the season, early September. 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.