Woolly-Leaf-Gall Midge Blaesodiplosis sp. A ...
induces triangular monothalamous galls on the upper surface of leaves of [Amelanchier utahensis and A. alnifolia] ... red-tipped galls [may] appear as a single, hairy white mass ... There is a slight protrusion on the [leaf underside].
[photo at Plate 552]
”- Russo, Ronald A. : (2021) Plant Galls of the Western United States©