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Photo#433549
Hackberry Psyllid - Pachypsylla celtidisasterisca

Hackberry Psyllid - Pachypsylla celtidisasterisca
Westmont, Camden County, New Jersey, USA
July 21, 2010
Size: Maybe around 5 - 6 mm?
It looks like the galls start off by the leaf dimpling up to make a small green nipple looking structure. Then the sides spread out and upwards to make an off-white bowl with a red starburst inside the bowl (and maybe a hole in the center). The center of the bowl then pops upwards and inflates to look like a little green apple on the leaf. Under the leaf is a more or less clean looking (hairless) gaping hole, although there may be hairs inside the bubble just not blocking the hole.

Bump in the back, mushroomy bowl in the front.

EDIT: I think these are UNDER the leaf.

Images of this individual: tag all
Hackberry Psyllid - Pachypsylla celtidisasterisca Hackberry Psyllid - Pachypsylla celtidisasterisca Hackberry Psyllid - Pachypsylla celtidismamma Hackberry Psyllid - Pachypsylla celtidismamma Hackberry Psyllid - Pachypsylla celtidismamma Hackberry Psyllid - Pachypsylla celtidisasterisca Hackberry Psyllid - Pachypsylla celtidismamma Hackberry Psyllid - Pachypsylla celtidismamma Hackberry Psyllid - Pachypsylla celtidisasterisca Hackberry Psyllid - Pachypsylla celtidismamma Hackberry Psyllid - Pachypsylla celtidismamma

Moved
Moved from Hackberry Psyllids.

Moved
Moved from Unidentified Galls. Frassed a bunch

Hackberry
You've already figured out that the tree is Hackberry (Celtis occidentalis); your photos show good indicators of that species: asymmetrical leaf bases, hairy veins on underside of leaf, and zigzagging twigs.

Hackberry galls
I think you've got two different things here. I think the disk-shaped ones are Celticecis midge galls, but apparently it's not certain what exact species produces them. There are many different kinds of fancy-shaped midge galls on hackberry, and only some have been described (same deal with hickory). The more bloated ones, which I presume are the ones that are bowl-shaped on the upper surface of the leaf, I think are Pachypsylla but not positive. Felt doesn't illustrate many of the psyllid galls on hackberry for some reason. Sometime (maybe this winter) I'll try and track down the original descriptions of these--hopefully they are illustrated--and see if I can make sense of them.

Can you double check and see whether the disk-shaped ones are fully detachable (only on one surface of the leaf) or have the beginnings of a bowl-shaped depression on the other side? If the latter, maybe I'm wrong about them being midge galls, and maybe you're right that they're all the same.

 
Image
Seems to match this one. Galls on bottom and both types (balls and disks)

 
Okay
There are photos of similar galls (discs) in this book (1) -- that must be what I was looking at before. They are identified only as "hackberry button galls," the products of psyllids. Based on other sources (e.g. Felt) it seems that all psyllids that make galls on hackberry belong to Pachpsylla. I'm still hopeful that I can figure out the species if I go to the primary literature. I'm still inclined to think you have two different kinds, both made by psyllids, and I don't think the ones with bowl-shaped depressions would be considered button galls... but maybe I'm wrong, and somehow the disks distort into balls/bowls when they open to let the adults out.

 
Nothing conclusive
other than "Yes Pachypsylla". The disks contained smaller nymphs so they may be younger, but that still doesn't rule out another species in the same genus. The structure is also similar and I can imagine a growth from a disk to a sphere that could occur, but that doesn't mean that it does occur.

 
Info
After checking it seems:
All of the galls (off-white disks and "little green apples") are on the bottom of the leaf.
All of the "little green apples" galls have the gaping hole on the upper surface of the leaf.
All of the off-white disks with red markings have the image just added on the upper surface of the leaf.

Without following one gall through its life I can't be sure if the depression deepens and becomes a hole or if they are 2 different galls.

 
Midge galls
Based on that, I feel pretty good about calling the disks midge galls... although, if you still have them, you can settle it for sure by breaking them open (both kinds) and seeing what's inside.

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