Galls
Page Last Updated: February 27 2021
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Fruit fly (Eurosta solidaginis - Goldenrod Gall Fly) -
Downy woodpeckers prey on the larvae - also known as
Apple Gall
Moths in the families Tortricidae (Epiblema scudderiana)
and Gelechiidae (
Gnorimoschema gallaesolidaginis) are
known to cause elliptical galls
Midge gall on Canada Goldenrod - approx. 2 cm - Lower Don Valley (Leaside) - August 2008
Midge Gall on Wild Grape - approx. 4 cm - York Regional Forest (Hall Tract) - August 2018
Willow Pinecone Gall Midge on Missouri Willow - approx. 4 cm - Don Mills - August 2014
Sumac Gall Aphid on Staghorn Sumac - approx. 4 cm - Lower Don Valley (Crother's Woods) - September 2011
Fruit Fly Gall on Goldenrod - approx. 4 cm - Lower Don Valley (Crother's Woods) - August 2010
Fruit Fly (Urophora cardui)
Midge Gall on Wild Grape - approx. 2 cm - Lower Don Valley (Leaside) - July 2014
Fruit fly (Procecidochares atra) - A second type of bunch
gall
Midge (Rhopalomyia solidaginis) - Goldenrod Bunch Gall -
also known as Rosette Gall
Fruit Fly Gall on Canada Thistle - approx. 3 cm - Lower Don Valley (Crother's Woods) - August 2009
Fruit Fly Gall on Goldenrod - diameter approx. 2.5 cm - Kortright Centre for Conservation - July 2009
Moth Gall on Goldenrod - approx. 4 cm - Lower Don Valley (Leaside) - August 2011
Midge Gall on Goldenrod - approx. 10 cm - Claireville Conservation Area - July 2010
Plant-parasitic Hemipteran (Daktulosphaira vitifoliae)
Plant-parasitic Hemipteran Gall on Wild Grape - approx. 1 cm - Terra Cotta Conservation Area - August 2017
Willow Rosette Gal  on Sandbar Willow - approx. 3 cm - Toronto Islands - September 2020
Gall Midge (Rabdophaga species)
Mossy Rose Gall on Sweetbrier - approx. 5 cm - Leslie Spit - August 2017
Gall Wasp (Diplolepis rosae)
Mordwilkoja vagabunda Aphid on Poplar species - approx. 4 cm - Toronto Islands - September 2020
Gall Wasp on Oak species - approx. 1 cm - Markham (Warden & Steeles) - July 2020
Gall Mites on Silver Maple - galls approx. 1 cm - Markham (Warden & Steeles) - July 2020
Gall Wasp (Amphibolips species)
Gall Wasp on Oak species - approx. 3 mm - Markham (Warden & Steeles) - September 2020
Gall Wasp (Cynipidae species)
Gall Wasp on Oak species - approx. 5 mm - Lambton Park - August 2020
Gall Wasp (Dryocosmus rileyi)
Gall Mites on Black Cherry - galls approx. 5 mm - High Park - May 2010
Witch Hazel Cone Gall Aphid on Witch Hazel - approx. 5 mm - Lower Don Valley (Crother's Woods) - July 2010
Adelges species on Norway Spruce - gall approx. 1.5 cm - Mono Mills (Caledon) - August 2019
Plant-parasitic Hemipteran (Adelges species)
Gall Wasp on Oak species - approx. 5 mm - Lambton Park - August 2020
Gall Wasp (Cynipidae species)
Gall Mites on Little-leaf Linden - galls approx. 1 cm - Toronto Islands - June 2018
Hackberry Nipplegall on Hackberry - gall approx. 7 mm - High Park - October 2020
Plant-parasitic Hemipteran (Pachypsylla celtidismamma)
Maple Bladdergall Mites on Silver Maple - galls approx. 3 mm - Lower Don Valley (Crother's Woods) - June 2016
Maple Spindlegall Mites on Sugar Maple - galls approx. 5 mm - York Regional Forest (Eldred King Tract) - August 2018
Gall Wasp on Oak species - approx. 1 cm - Lambton Park - August 2020
Gall Wasp on Oak species - approx. 1 cm - Lambton Park - August 2020
Gall Wasp (Callirhytis furva?)
Gall Wasp (Callirhytis furva?)