Leafminers
Galls, Galls, Galls!
Leafminers
Eriophyidae Gall Mite
Eriophyidae
underside galls
on River Birch
(Betula nigra)
Sep 16, 2022
Arrowhead Park
Eriophyidae Gall Mite
Eriophyidae
upperside galls
on River Birch
(Betula nigra)
Sep 16, 2022
Arrowhead Park
Oak Blister Gall Mite
Aceria querci
open gall
on Bur Oak
(Quercus macrocarpa)
Aug 15, 2022
Arrowhead Park
Oak Blister Gall Mite
Aceria querci
upperside gall
on Bur Oak
(Quercus macrocarpa)
Aug 15, 2022
Arrowhead Park
Oak Blister Gall Mite
Aceria querci
open gall
on Bur Oak
(Quercus macrocarpa)
Sep 28, 2022
Russell R. Kirt Prairie
Oak Blister Gall Mite
Aceria querci
upperside galls
on Bur Oak
(Quercus macrocarpa)
Sep 28, 2022
Russell R. Kirt Prairie
Ash Key Gall Mite
Aceria fraxinivora
galls
on Green Ash
(Fraxinus pennsylvanica)
Jul 2, 2022
Naperville
Ash Bead Gall Mite
Aceria fraxini
underside galls
on Green Ash
(Fraxinus pennsylvanica)
Jul 23, 2022
Naperville
Ash Bead Gall Mite
Aceria fraxini
upperside galls
on Green Ash
(Fraxinus pennsylvanica)
Jul 23, 2022
Naperville
Ash Bead Gall Mite
Aceria fraxini
underside galls
on Green Ash
(Fraxinus pennsylvanica)
Aug 18, 2022
Arrowhead Park
Ash Bead Gall Mite
Aceria fraxini
upperside galls
on Green Ash
(Fraxinus pennsylvanica)
Aug 18, 2022
Arrowhead Park
Lime Nail Gall Mite
Eriophyes tiliae
tip galls
on American Linden
(Tilia americana)
Jul 5, 2022
Naperville
Lime Nail Gall Mite
Eriophyes tiliae
upperside galls
on American Linden
(Tilia americana)
Jul 5, 2022
Naperville
Black Cherry Leaf Gall Mite
Eriophyes cerasicrumena
upperside galls
on Black Cherry
(Prunus serotina)
Aug 15, 2022
Arrowhead Park
Poison Ivy Leaf Mite
Aculops rhois
leaf galls
on Poison Ivy
(Toxicodendron radicans)
Jun 27, 2022
Herrick Lake Forest Preserve
Poison Ivy Leaf Mite
Aculops rhois
upperside galls
on Poison Ivy
(Toxicodendron radicans)
Jun 27, 2022
Herrick Lake Forest Preserve
Maple Bladdergall Mite
Vasates quadripedes
upperside galls
on Silver Maple
(Acer saccharinum)
Jul 6, 2022
Arrowhead Park
Maple Bladdergall Mite
Vasates quadripedes
upperside gall
on Red Maple
(Acer rubrum)
Jul 20, 2022
McDowell Grove Forest Preserve
Cotton-gall Tephritid
Aciurina bigeloviae
gall
on Rubber Rabbitbrush
(Ericameria nauseosa)
Dec 14, 2024
Grand Canyon
Cotton-gall Tephritid
Aciurina bigeloviae
open gall
on Rubber Rabbitbrush
(Ericameria nauseosa)
Dec 14, 2024
Grand Canyon
Carbonifera Goldenrod Gall Midge
Asteromyia carbonifera
galls
on Tall Goldenrod
(Solidago altissima)
Sep 6, 2022
Naperville
Carbonifera Goldenrod Gall Midge
Asteromyia carbonifera
backlit galls
on Tall Goldenrod
(Solidago altissima)
Sep 28, 2022
Russell R. Kirt Prairie
Carbonifera Goldenrod Gall Midge
Asteromyia carbonifera
galls
on Tall Goldenrod
(Solidago altissima)
Sep 28, 2022
Russell R. Kirt Prairie
Cecidomyiidae Gall Midge
Cecidomyiidae
gall
on Sawtooth Sunflower
(Helianthus grosseserratus)
Oct 5, 2022
Springbrook Prairie
Cecidomyiidae Gall Midge
Cecidomyiidae
open gall
on Sawtooth Sunflower
(Helianthus grosseserratus)
Oct 5, 2022
Springbrook Prairie
Goldenrod Gall Fly
Eurosta solidaginis
gall larva
on Canada Goldenrod
(Solidago canadensis)
Oct 25, 2006
Russell R. Kirt Prairie
Goldenrod Gall Fly
Eurosta solidaginis
gall larva
on Canada Goldenrod
(Solidago canadensis)
Apr 9, 2008
Russell R. Kirt Prairie
Sawtooth Sunflower Midge
Pilodiplosis helianthibulla
underside gall
on Sawtooth Sunflower
(Helianthus grosseserratus)
Jul 19, 2022
Herrick Lake Forest Preserve
Sawtooth Sunflower Midge
Pilodiplosis helianthibulla
upperside gall
on Sawtooth Sunflower
(Helianthus grosseserratus)
Jul 19, 2022
Herrick Lake Forest Preserve
Sawtooth Sunflower Midge
Pilodiplosis helianthibulla
open gall
on Sawtooth Sunflower
(Helianthus grosseserratus)
Aug 12, 2023
Hinsdale Prairie
Sawtooth Sunflower Midge
Pilodiplosis helianthibulla
underside gall
on Sawtooth Sunflower
(Helianthus grosseserratus)
Aug 12, 2023
Hinsdale Prairie
Sawtooth Sunflower Midge
Pilodiplosis helianthibulla
upperside gall
on Sawtooth Sunflower
(Helianthus grosseserratus)
Aug 12, 2023
Hinsdale Prairie
Goldenrod Bunch Gall Midge
Rhopalomyia solidaginis
gall pupa
on Canada Goldenrod
(Solidago canadensis)
Sep 17, 2015
Russell R. Kirt Prairie
Goldenrod Bunch Gall Midge
Rhopalomyia solidaginis
gall pupa dorsal
on Canada Goldenrod
(Solidago canadensis)
Sep 17, 2015
Russell R. Kirt Prairie
Oak majalis Gall Midge
Macrodiplosis majalis
gall
on Red Oak
(Quercus rubra)
Jul 2, 2022
Naperville
Oak majalis Gall Midge
Macrodiplosis majalis
gall
on Pin Oak
(Quercus palustris)
Aug 22, 2022
Arrowhead Park
Oak Leaf Gall Midge
Polystepha pilulae
upperside galls
on Red Oak
(Quercus rubra)
Jun 27, 2022
Herrick Lake Forest Preserve
Hickory Onion Gall Midge
Caryomyia caryaecola
underside galls
on Shagbark Hickory
(Carya ovata)
Jun 24, 2022
Herrick Lake Forest Preserve
Hickory Spiny Gall Midge
Caryomyia echinata
underside galls
on Shagbark Hickory
(Carya ovata)
Jul 19, 2022
Herrick Lake Forest Preserve
Hickory Spiny Gall Midge
Caryomyia echinata
underside galls
on Shagbark Hickory
(Carya ovata)
Aug 22, 2023
Herrick Lake Forest Preserve
Hickory Spiny Gall Midge
Caryomyia echinata
upperside galls
on Shagbark Hickory
(Carya ovata)
Aug 22, 2023
Herrick Lake Forest Preserve
Hickory Placenta Gall Midge
Caryomyia thompsoni
underside gall
on Shagbark Hickory
(Carya ovata)
Jun 24, 2022
Herrick Lake Forest Preserve
Citrina Gall Midge
Contarinia citrina
gall
on American Linden
(Tilia americana)
Sep 16, 2024
Morton Arboretum
Linden Wart Gall Midge
Contarinia verrucicola
underside gall
on American Linden
(Tilia americana)
Sep 16, 2024
Morton Arboretum
Linden Wart Gall Midge
Contarinia verrucicola
upperside gall
on American Linden
(Tilia americana)
Sep 16, 2024
Morton Arboretum
Hawthorn Gall Midge
Blaesodiplosis canadensis
underside gall
on Cockspur Hawthorn
(Crataegus crus galli)
Oct 2, 2022
Danada Forest Preserve
Hawthorn Gall Midge
Blaesodiplosis canadensis
upperside gall
on Cockspur Hawthorn
(Crataegus crus galli)
Oct 2, 2022
Danada Forest Preserve
Contarinia Gall Midge
Contarinia
open gall
on Box Elder
(Acer negundo)
Aug 13, 2022
McDowell Grove Forest Preserve
Contarinia Gall Midge
Contarinia
upperside gall
on Box Elder
(Acer negundo)
Aug 13, 2022
McDowell Grove Forest Preserve
Contarinia Gall Midge
Contarinia
underside gall
on Box Elder
(Acer negundo)
Oct 10, 2022
Arrowhead Park
Contarinia Gall Midge
Contarinia
upperside gall
on Box Elder
(Acer negundo)
Oct 10, 2022
Arrowhead Park
Contarinia Gall Midge
Contarinia
upperside open gall
on Box Elder
(Acer negundo)
Oct 10, 2022
Arrowhead Park
Cypress Twig Gall Midge
Taxodiomyia cupressiananassa
galls
on Bald Cypress
(Taxodium distichum)
Oct 9, 2020
COD Main Campus
Cedar-Quince Rust
Gymnosporangium clavipes
overwintering gall
on Washington Hawthorn
(Crataegus phaenopyrum)
Oct 5, 2022
Springbrook Prairie
Eutypella Canker
Eutypella parasitica
canker
on Sugar Maple
(Acer saccharum)
May 4, 2023
Morton Arboretum
Cedar-Apple Rust
G. juniperi virginianae
gall
on Eastern Red Cedar
(Juniperus virginiana)
Jun 16, 2022
Arrowhead Park
Cedar-Apple Rust
G. juniperi virginianae
side gall
on Eastern Red Cedar
(Juniperus virginiana)
Apr 30, 2024
Arrowhead Park
Cedar-Apple Rust
G. juniperi virginianae
top gall
on Eastern Red Cedar
(Juniperus virginiana)
Apr 30, 2024
Arrowhead Park
Globular Hickory Phylloxera
Phylloxera caryaeglobuli
underside galls
on Shagbark Hickory
(Carya ovata)
Jul 19, 2022
Herrick Lake Forest Preserve
Globular Hickory Phylloxera
Phylloxera caryaeglobuli
upperside galls
on Shagbark Hickory
(Carya ovata)
Jul 19, 2022
Herrick Lake Forest Preserve
Phylloxera Aphid
Phylloxera
underside gall
on Shagbark Hickory
(Carya ovata)
Aug 22, 2023
Herrick Lake Forest Preserve
Phylloxera Aphid
Phylloxera
upperside gall
on Shagbark Hickory
(Carya ovata)
Aug 22, 2023
Herrick Lake Forest Preserve
Red Bay Psyllid
Trioza magnoliae
open gall
on Redbay
(Persea borbonia)
Feb 22, 2025
Split Rock Conservation Area
Red Bay Psyllid
Trioza magnoliae
upperside gall
on Redbay
(Persea borbonia)
Feb 22, 2025
Split Rock Conservation Area
Poplar Leaf-base Gall Aphid
Pemphigus populicaulis
gall
on Cottonwood
(Populus deltoides)
Jul 6, 2022
Arrowhead Park
Poplar Petiole Gall Aphid
Pemphigus populitransversus
gall
on Cottonwood
(Populus deltoides)
Oct 8, 2011
COD Seed Collection
Hackberry Nipplegall Psyllid
Pachypsylla celtidismamma
underside galls
on Hackberry
(Celtis occidentalis)
Aug 31, 2021
Naperville
Oriental Grass Root Aphid
Tetraneura akinire
upperside galls
on American Elm
(Ulmus americana)
Jul 2, 2022
Naperville
Grape Phylloxera
Daktulosphaira vitifoliae
underside gall
on Riverbank Grape
(Vitis riparia)
Jul 19, 2022
Herrick Lake Forest Preserve
Grape Phylloxera
Daktulosphaira vitifoliae
underside galls
on Riverbank Grape
(Vitis riparia)
Jul 19, 2022
Herrick Lake Forest Preserve
Grape Phylloxera
Daktulosphaira vitifoliae
upperside gall
on Riverbank Grape
(Vitis riparia)
Jul 19, 2022
Herrick Lake Forest Preserve
Grape Phylloxera
Daktulosphaira vitifoliae
upperside galls
on Riverbank Grape
(Vitis riparia)
Jul 19, 2022
Herrick Lake Forest Preserve
Oak Rough Bulletgall Wasp
drinking gall Bald-faced Hornet
Disholcaspis quercusmamma
drinking gall Bald-faced Hornet
Bald-faced Hornet drinking gall
Aug 31, 2021
Naperville
Hedgehog Gall Wasp
Acraspis erinacei
gall
on White Oak
(Quercus alba)
Feb 26, 2008
Russell R. Kirt Prairie
Hedgehog Gall Wasp
Acraspis erinacei
gall Lacewing egg
on White Oak
(Quercus alba)
Jul 29, 2021
Russell R. Kirt Prairie
Jewel Oak Gall Wasp
Acraspis quercushirta
underside gall
on Bur Oak
(Quercus macrocarpa)
Aug 30, 2021
Arrowhead Park
Jewel Oak Gall Wasp
Acraspis quercushirta
underside gall
on Bur Oak
(Quercus macrocarpa)
Jun 24, 2022
Herrick Lake Forest Preserve
Jewel Oak Gall Wasp
Acraspis quercushirta
underside gall
on Bur Oak
(Quercus macrocarpa)
Jul 19, 2022
Herrick Lake Forest Preserve
Jewel Oak Gall Wasp
Acraspis quercushirta
open gall
on Bur Oak
(Quercus macrocarpa)
Aug 15, 2022
Arrowhead Park
Jewel Oak Gall Wasp
Acraspis quercushirta
upperside gall
on Bur Oak
(Quercus macrocarpa)
Aug 15, 2022
Arrowhead Park
Larger Empty Oak Apple Wasp
Amphibolips quercusinanis
empty gall
on Red Oak
(Quercus rubra)
Jun 27, 2022
Herrick Lake Forest Preserve
Larger Empty Oak Apple Wasp
Amphibolips quercusinanis
gall
on Red Oak
(Quercus rubra)
Jun 27, 2022
Herrick Lake Forest Preserve
Live Oak Apple Gall Wasp
Amphibolips quercuspomiformis
gall
on California Live Oak
(Quercus agrifolia)
Feb 11, 2024
San Diego River Trail
Live Oak Apple Gall Wasp
Amphibolips quercuspomiformis
open gall
on California Live Oak
(Quercus agrifolia)
Feb 11, 2024
San Diego River Trail
Oak Petiole Gall Wasp
Andricus quercuspetiolicola
galls
on Swamp White Oak
(Quercus bicolor)
Sep 5, 2021
Naperville
Lobed Oak Gall Wasp
Andricus quercusstrobilanus
galls
on Swamp White Oak
(Quercus bicolor)
Sep 7, 2011
Russell R. Kirt Prairie
Lobed Oak Gall Wasp
Andricus quercusstrobilanus
galls
on Swamp White Oak
(Quercus bicolor)
Aug 23, 2013
Russell R. Kirt Prairie
Lobed Oak Gall Wasp
Andricus quercusstrobilanus
galls
on Swamp White Oak
(Quercus bicolor)
Sep 3, 2015
Danada Forest Preserve
Lobed Oak Gall Wasp
Andricus quercusstrobilanus
galls
on Swamp White Oak
(Quercus bicolor)
Sep 10, 2015
Russell R. Kirt Prairie
Lobed Oak Gall Wasp
Andricus quercusstrobilanus
galls
on Swamp White Oak
(Quercus bicolor)
Sep 5, 2021
Russell R. Kirt Prairie
Southern Live Oak Gall Wasp
Callirhytis quercusbatatoides
nipple gall
on Southern Live Oak
(Quercus virginiana)
Feb 22, 2025
Split Rock Conservation Area
Southern Live Oak Gall Wasp
Callirhytis quercusbatatoides
open gall
on Southern Live Oak
(Quercus virginiana)
Feb 22, 2025
Split Rock Conservation Area
Southern Live Oak Gall Wasp
Callirhytis quercusbatatoides
round gall
on Southern Live Oak
(Quercus virginiana)
Feb 22, 2025
Split Rock Conservation Area
Oak Wart Gall Wasp
Callirhytis quercusfutilis
underside gall
on White Oak
(Quercus alba)
Aug 6, 2022
Herrick Lake Forest Preserve
Oak Wart Gall Wasp
Callirhytis quercusfutilis
upperside gall
on White Oak
(Quercus alba)
Aug 6, 2022
Herrick Lake Forest Preserve
Lacuna Oak Gall Wasp
Disholcaspis lacuna
galls
on Gambel Oak
(Quercus gambelii)
Oct 19, 2024
Flagstaff
Oak Rough Bulletgall Wasp
Disholcaspis quercusmamma
galls
on Swamp White Oak
(Quercus bicolor)
Aug 25, 2016
Russell R. Kirt Prairie
Oak Rough Bulletgall Wasp
Disholcaspis quercusmamma
gall
on Swamp White Oak
(Quercus bicolor)
Aug 31, 2021
Naperville
Oak Rough Bulletgall Wasp
Disholcaspis quercusmamma
gall
on Swamp White Oak
(Quercus bicolor)
Sep 5, 2021
Russell R. Kirt Prairie
Oak Rough Bulletgall Wasp
Disholcaspis quercusmamma
gall
on Chinquapin Oak
(Quercus muehlenbergii)
Jul 20, 2022
McDowell Grove Forest Preserve
Oak Rough Bulletgall Wasp
Disholcaspis quercusmamma
open gall
on Chinquapin Oak
(Quercus muehlenbergii)
Jul 20, 2022
McDowell Grove Forest Preserve
Druon ignotum Oak Gall Wasp
Druon ignotum
underside galls
on Bur Oak
(Quercus macrocarpa)
Jun 24, 2022
Herrick Lake Forest Preserve
Druon ignotum Oak Gall Wasp
Druon ignotum
underside gall
on Bur Oak
(Quercus macrocarpa)
Oct 10, 2022
Arrowhead Park
Succulent Oak Gall Wasp
Dryocosmus quercuspalustris
open gall
on Pin Oak
(Quercus palustris)
May 30, 2023
Naperville
Succulent Oak Gall Wasp
Dryocosmus quercuspalustris
underside gall
on Pin Oak
(Quercus palustris)
May 30, 2023
Naperville
Oak Button Gall Wasp
Neuroterus umbilicatus
underside galls
on Swamp White Oak
(Quercus bicolor)
Sep 21, 2023
DuPage County
Oak Button Gall Wasp
Neuroterus umbilicatus
upperside galls
on Swamp White Oak
(Quercus bicolor)
Sep 21, 2023
DuPage County
Jumping Oak Gall Wasp
Neuroterus
underside galls
on White Oak
(Quercus alba)
Jun 29, 2006
Russell R. Kirt Prairie
Conical Oak Gall Wasp
Phylloteras volutellae
underside galls
on Bur Oak
(Quercus macrocarpa)
Aug 30, 2021
Arrowhead Park
Conical Oak Gall Wasp
Phylloteras volutellae
underside galls
on Swamp White Oak
(Quercus bicolor)
Sep 5, 2021
Russell R. Kirt Prairie
