Woolly Oak Aphid

Stegophylla essigi (?)

small white aphids, Stegophylla essigi, inside folded leaf of Emory Oak © by Michael Plagens

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.

Aphididae -- an Aphid Bug Family

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Arizona Naturalist
Sycamore Canyons
Invertebrates in Arizona's Sycamore Canyons


Copyright Michael J. Plagens, page created 18 January 2015