What is this pear disease?

Asked May 7, 2017, 8:48 PM EDT

Please see the pictures. One pear tree has some leaves with blistering and curling. The blisters start out pink. Is this pear leaf blister mite? I've trimmed off infected twigs. I already spray with dormant oil and neem in the fall/winter- what else can I do to prevent this?

Clackamas County Oregon

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