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Pear Blister Mite

Phytoptus pyri    In a nutshell, it is a mite, and it causes blisters. These cause blisters not to humans (unlike the common blister beetles which do) but to the foliage. Damage can include both leaves, especially younger growth, but also the fruit itself. Introduced from Europe, this tiny arachnid often moves about undetected due simply to its size. Damage will often occur before any of the actual creatures are observed. More to come…