Woolly Oak Aphid
Stegophylla essigi (?)
Leaf of Emory Oak at Mt. Ord, Maricopa Co., Arizona. 21 July 2017. A small white aphid from inside at lower right. June 2012.
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As far as I've been able to determine, the insect Stegophylla essigi has not been recorded in Arizona, so at this point my identification is a guess. The folds on the oak leaves were very stiff. These folds are gall-like in that the leaf is swollen as well. Inside each fold I found several chalky-white, very slow moving bugs.