Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Register
·
Log In
Home
Guide
ID Request
Recent
Frass
Forums
Donate
Help
Clickable Guide
Calendar
Upcoming Events
Registration
is open for the
2024 BugGuide gathering in Idaho
July 24-27
Moth submissions
from
National Moth Week 2023
Photos of
insects
and
people
from the
2022 BugGuide gathering in New Mexico
, July 20-24
Photos of
insects
and
people
from the
Spring 2021 gathering in Louisiana
, April 28-May 2
Photos of
insects
and
people
from the
2019 gathering in Louisiana
, July 25-27
Photos of
insects
and
people
from the
2018 gathering in Virginia
, July 27-29
Previous events
Taxonomy
Browse
Info
Images
Links
Books
Data
Home
» Guide »
Arthropods (Arthropoda)
»
Hexapods (Hexapoda)
»
Insects (Insecta)
»
True Bugs, Cicadas, Hoppers, Aphids and Allies (Hemiptera)
»
Plant-parasitic Hemipterans (Sternorrhyncha)
»
Aphidoidea
»
Aphids (Aphididae)
»
Woolly Aphids and Gall-making Aphids (Eriosomatinae)
»
Pemphigini
»
Pemphigus
»
Poplar Petiolegall Aphid (Pemphigus populitransversus)
Photo#346728
Copyright © 2009
MJ Hatfield
Pemphigus populitransversus, gall on cottonwood -
Pemphigus populitransversus
Plymouth Rock, Winneshiek County, Iowa, USA
October 18, 2009
Collected 11-Oct-2009
tag
·
login
or
register
to post comments
Contributed by
MJ Hatfield
on 26 October, 2009 - 7:21am
Last updated 26 November, 2009 - 1:24pm
Moved
Moved from
Pemphigus populicaulis
. Now
this
one I'd be comfortable calling
Pemphigus populitransversus
: an oval gall with a transverse slit, not touching the leaf blade, and on an aspen leaf.
P. populicaulis
galls are more irregularly shaped, have an oblique opening, and are at the base of cottonwood leaf blades. I wonder if the one in your other image could be an atypically placed
P. populitransversus
gall?
…
Charley Eiseman
, 26 October, 2009 - 8:54am
login
or
register
to post comments
Except..
I showed this to John Pearson, botanist, and it is a cottonwood leaf not an aspen. Does that change things?
…
MJ Hatfield
, 30 October, 2009 - 8:21pm
login
or
register
to post comments
I don't think so.
Whereas
Pemphigus populicaulis
apparently is only found on cottonwoods, Felt doesn't specify a host for
Pemphigus populitransversus
beyond the genus
Populus
, which includes both cottonwoods and aspens. I've never found this species on a cottonwood leaf, but this gall looks just like the ones I've found on aspen leaves.
…
Charley Eiseman
, 30 October, 2009 - 8:25pm
login
or
register
to post comments
uh oh
It looks as if I have 2 different Pemphigus galls in the same container, so there is no way to know which gall the aphids that emerged are associated with. Perhaps since the galls are both Pemphigus I can move the insects to family level and leave the galls separate. What say you?
…
MJ Hatfield
, 26 October, 2009 - 9:27am
login
or
register
to post comments
Yes
I'd unlink the aphids from the gall and move them to genus level, with thumbnails linking to both of the galls that were in the container.
…
Charley Eiseman
, 26 October, 2009 - 9:30am
login
or
register
to post comments
Comment viewing options
Flat list - collapsed
Flat list - expanded
Threaded list - collapsed
Threaded list - expanded
Date - newest first
Date - oldest first
10 comments per page
30 comments per page
50 comments per page
70 comments per page
90 comments per page
Select your preferred way to display the comments and click 'Save settings' to activate your changes.