Appearance
"Eriophyes laevis " makes small, more or less, pimple-like galls, up to 2 mm in diameter. They can cover most of the leaf which can restrict growth. Each gall has a narrow opening on the underside of the leaf. The galls are green at first but usually become purple or red later in the year. The mites leave the gall in autumn and spend the winter in empty alder cones or bark crevices.Species of tree galled include common alder, grey alder & subsp. "rugosa" + "tenuifolia", x "pubescens", red alder and green alder. Leaves are occasionally infected by both this species and Eriophyes inangulis. Identification of gall mites on alder is tentative and the mites need to be examined for positive identification.
;Inquiline
"Diptacus sacramentae" are mites found on the underside of leaves and also live commensally in the gall as an inquiline. "D. sacramentae" can also occur as an inquiline of "E. inangulis".
Distribution
The mite is found in Europe and the United States of America.References:
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