Aceria pseudoplatani agg

Sycamore Felt Gall

Aceria pseudoplatani agg, Sycamore Felt Gall. Microscopic mites that infect the underside of Sycamore, Acer pseudoplatanus, leaves, causing felty patches. The upper leaf surface shows small raised mounds. Galls are abnormal growths of the plant caused by the parasites. The Aceria pseudoplatani mites are often accompanied by larger predatory mites.

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Aceria pseudoplatani, Sycamore Felt Gall

Gall patches

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Galls along veins

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Gall detail

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Gall fragments

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Mites on gall

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Gall Mite

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Predatory mite

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Predatory mites mating

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Photograph detail

Slide 1: Aceria pseudoplatani agg, Sycamore Felt Gall. Felty patches under Sycamore, Acer pseudoplatanus, leaves. Disused railway. Hargill, Redmire. August.

Slide 2: Aceria pseudoplatani agg, Sycamore Felt Gall. Felty patches under Sycamore, Acer pseudoplatanus, leaves, following leaf veins. Collected from disused railway. Hargill, Redmire. August.

Slide 3: Aceria pseudoplatani agg, Sycamore Felt Gall. Detail of gall. Collected from disused railway. Hargill, Redmire. August.

Slide 4: Aceria pseudoplatani agg, Sycamore Felt Gall. Fragments of gall. Photographed at x100, brightfield illumination. Collected from disused railway. Hargill, Redmire. August.

Slide 5: Aceria pseudoplatani agg, Sycamore Felt Gall. Two gall mites visible. Collected from disused railway. Hargill, Redmire. August.

Slide 6: Aceria pseudoplatani agg, Sycamore Felt Gall. Gall mite. Photographed at x400, brightfield illumination. Collected from disused railway. Hargill, Redmire. August.

Slide 7: Larger predatory mite found in a felty gall. Photographed at x400, brightfield illumination. Collected from disused railway. Hargill, Redmire. August.

Slide 8: Mating pair of larger predatory mites found in felty gall. Collected from disused railway. Hargill, Redmire. August.