Aphids
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Giant Bark Aphids                                          Longistigma caryae
on Sycamore Tree
Potomac River
Washington County, Maryland
May 29, 2004
Photographer:  Richard Orr
Conifer Root Aphids                                       Prociphilus sp.
Attended by the ant Lasius umbratus
Assateague Island National Seashore
Worcester County, Maryland
April 2, 2007
Photographer:  Richard Orr
Witch Hazel Gall Aphid                                 Hamamelistes spinosus
Patapsco Valley State Park
Howard County, Maryland
July 12, 2010
Photographer:  Richard Orr
Witch-hazel Gall Aphid (gall)                       Hormaphis hamamelidis
on Witch-hazel tree leaf
Patapsco Valley State Park
Howard County, Maryland
May 7, 2011
Photographer:  Richard Orr
Red Goldenrod Aphid                                    Uroleucon nigrotuberculatum
on goldenrod
Potomac River
Washington County, Maryland
June 7, 2011
Photographer:  Richard Orr
Milkweed Aphid                                              Aphis nerii
on milkweed
Lake Elkhorn Environs
Howard County, Maryland
September 2, 2011
Photographer:  Richard Orr
Woolly Alder Aphid                                         Prociphilus tessellatus
On Alder
Mt. Pleasant Howard County Conservancy
Howard County, Maryland
October 8, 2011
Photographer:  Richard Orr
Elm Cockscomb Gall Aphid                         Colopha ulmicola
On Elm
C&O Canal at Town Creek
Allegany County, Maryland
May 31, 2014
Photographer:  Richard Orr
Beech Blight Aphids                                      Grylloprociphilus imbricator
On Beech Tree
Rockburn Branch Park
Howard County, Maryland
August 15, 2015
Photographer:  Richard Orr
Goldenglow Aphids                                       Uroleucon rubeckiae
on Crownbeard
Middle Patuxent Environmental Area
Howard County, Maryland
August 25, 2015
Photographer:  Richard Orr