Harmandiola p-tristis-leaf-spot

The inducer of this gall is unknown or undescribed.
Family: Cecidomyiidae | Genus: Harmandiola
Detachable: integral
Color: green
Texture: hairless
Abundance:
Shape:
Season: Summer, Spring, Fall
Related:
Alignment: integral
Walls:
Location: upper leaf, between leaf veins
Form: leaf spot
Cells: not applicable
Possible Range:i
Common Name(s):
Synonymy:
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image of Harmandiola p-tristis-leaf-spot
image of Harmandiola p-tristis-leaf-spot
image of Harmandiola p-tristis-leaf-spot
image of Harmandiola p-tristis-leaf-spot
image of Harmandiola p-tristis-leaf-spot
image of Harmandiola p-tristis-leaf-spot
image of Harmandiola p-tristis-leaf-spot

Gallformers ID Notes

An exposed larva on the lower side of the leaf lamina of Populus tristis causing a circular green spot and a slight raised papilla on the upper side. Observed from southern CA up to Washington. There may be multiple generations per year; fresh galls with larvae have been seen in May and September.

This gall can only be distinguished from the similar p-balsamifera-leaf-gall by host ID. There are places where both hosts occur, and distinguishing the two plants can be difficult. It is possible that the two midges are in fact conspecific.

- Gallformers Contributors: (2024) Gallformers ID Notes©


Further Information:
Pending...

See Also:
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value p-tristis-leaf-spot on iNaturalist. You can view them here:
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