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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » True Bugs, Cicadas, Hoppers, Aphids and Allies (Hemiptera) » Plant-parasitic Hemipterans (Sternorrhyncha) » Phylloxeroidea » Phylloxeridae » Phylloxera » Phylloxera glabra
Photo#119824
Scales?? - Phylloxera glabra
Copyright © 2007 Stephen Luk

Scales?? - Phylloxera glabra
Richmond Hill, York Region, Ontario, Canada
June 17, 2007
Size: 1 mm max.
These have invested my English Oaks (Quercus robur) for many years, but I've never photographed them until now. My first thought was some sort of scale, and these probably are, but I'm not entirely sure of that. Can't seem to find them in the Guide either. Some help, please?

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Scales?? - Phylloxera glabra Scales?? - Phylloxera glabra Scales?? - Phylloxera glabra Scales?? - Phylloxera glabra
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Contributed by Stephen Luk on 19 June, 2007 - 10:11pm
Last updated 29 August, 2021 - 10:06am

Moved
Moved from Phylloxera.

Bladmineerders lists three Phylloxera feeding in this way on Quercus robur (P quercus and coccinae); of the three, P glabra seems to match your insects in morphology. It has been reported in North America, though only in Oregon and California according to the sources (not comprehensive) I've seen so far.
… Adam Kranz, 29 August, 2021 - 10:06am login or register to post comments

Moved
Moved from Phylloxeridae.
Either a new host record or a species not known to occur in North America, based on the information here. Phylloxera spp. are very poorly known.
… Charley Eiseman, 22 December, 2010 - 8:15pm login or register to post comments

Moved
Moved from Plant-parasitic Hemipterans.
… Charley Eiseman, 22 December, 2010 - 3:59pm login or register to post comments

How about whiteflies?
These look like they could be whitefly nymphs, and the eggs are similar in appearance and arrangement to these greenhouse whitefly eggs.
… Charley Eiseman, 28 December, 2008 - 8:48pm login or register to post comments

 
Possibly...
However, I've watched the trees over the years, and have never once observed adult whiteflies during any season. And the creatures were abundant enough to seriously weaken some of the trees.
… Stephen Luk, 28 December, 2008 - 8:58pm login or register to post comments

 
Some psyllids
also have eggs that look sort of like this, but I don't know if any have nymphs like this. I'm pretty sure these aren't scale insects, at any rate, since they don't look scale-like and as far as I know all scale insects either deposit eggs in a waxy sac or concealed under the female's body. Then again, with 1000 or so species, I guess anything is possible...
… Charley Eiseman, 28 December, 2008 - 9:13pm login or register to post comments

 
Specimens
Earlier this summer, I handed live specimens of these bugs to one of the guys in the lab, who is working with insect pests of horticulture. I'll ask him sometime to see if he's figured out what these things are.
… Stephen Luk, 28 December, 2008 - 10:00pm login or register to post comments

 
. . .
Any news yet? I would love to know.
… Beatriz Moisset, 15 April, 2009 - 7:52am login or register to post comments

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