Harmandiola p-tremuloides-like-populnea

The inducer of this gall is unknown or undescribed.
Family: Cecidomyiidae | Genus: Harmandiola
Hosts: Populus tremuloides
Detachable: integral
Color: pink, red, green
Texture: hairless, succulent
Abundance:
Shape: globular, cluster
Season: Summer, Fall, Spring
Related:
Alignment: integral
Walls: thick
Location: upper leaf, lower leaf, leaf midrib, on leaf veins, at leaf vein angles
Form: abrupt swelling
Cells: monothalamous, polythalamous
Possible Range:i
Common Name(s):
Synonymy:
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image of Harmandiola p-tremuloides-like-populnea
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image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
image of Harmandiola p-tremuloides-like-populnea
Gallformers ID Notes
“

This morphotype may be the best fit for the name Harmandiola helena; see ID Notes on that page for more info.

Green to pink-red globular galls on Populus tremuloides showing equally on both sides of the leaf, often confluent where several grow nearby and sometimes sprawling onto adjacent veins, frequently found at the base of the leaf (but apparently never galling the petiole), succulent and thick-walled. They are unique among Populus leaf galls in having a circular rather than linear exit hole, which is typically but not always found on the upper side of the leaf. Circles are often visible before midges emerge, and these incipient holes are often seen on the opposite side of the one where midges eventually emerge as well. They are glossier and more succulent in texture than those of most Harmandiola galls. Variation in shape and density is greater for this morphotype than in many others, including some galls which present as a single large sphere rather than a flat cluster. Some of these variations may end up representing distinct species of midge inducers.

These galls resemble those Bladmineerders attributes to either Lasioptera populnea or Contarinia populi. It may not belong in the genus Harmandiola.

This gall morphotype can be distinguished from other midge galls on Populus leaves by the following traits:

  • Larva concealed within galled tissue protruding equally on both sides of the leaf
  • Circular rather than linear exit hole on the upper side of the leaf, though occasionally rings suggesting incipient openings are seen on the lower side as well
”

- Gallformers Contributors: (2023) 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-tremuloides-like-populnea on iNaturalist. You can view them here:
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