Galls

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Galls

Galls are abnormal growths on plants that can be caused by a number of different organisms including insects and diseases. Following are some of common galls. Most are found on trees and shrubs but other plants can also develop galls.

Specific galls

	Galls on Trees
	Gouty, Horned and other Twig Galls
	Gall-forming Eriophyd Mites
	Jumping Oak Galls

Other images


Burl on oak (Quercus)


Azalea gall caused by the fungus Exobasidium vaccinii, shown here on azalea (Rhododendron), can also infect plants in the genus Vaccinium


Azalea gall caused by the fungus Exobasidium vaccinii can infect the leaves, branch tips, flower parts and even seed pods of its host; here it is on azalea (Rhododendron)


Azalea galls (caused by the fungus Exobasidium vaccinii) should be pruned out before developing the whitish coating indicating the presence of spore producing bodies as shown here on azalea (Rhododendron)


These leafy rosettes on goldenrod (Solidago), called goldenrod bunch galls, are caused by a tephritid fruit fly (Diptera--Procecidochares atra))


Close-up of a leafy rosette, called a goldenrod bunch gall, on goldenrod (Solidago); these are caused by the feeding of a tephritid fruit fly (Diptera)


These leafy rosettes on goldenrod (Solidago), called goldenrod bunch galls, are caused by atephritid fruit fly (Diptera); the plant also has rust; notice, the orange pustules on the leaf at the top of the picture


Rosette gall caused by the midge Rhopalomyia solidagninis (Diptera) on Canada goldenrod (Solidago altissima) with an unknown rust


White blister galls on goldenrod (Solidago) caused by a midge (Diptera), Asteromyia carbonifera


White blister galls on goldenrod (Solidago) caused by a midge (Diptera), Asteromyia carbonifera


Close-up of white blister gall on goldenrod (Solidago) caused by a midge (Diptera), Asteromyia carbonifera


Blackberry seed gall on blackberry (Rubus) caused by a gall wasp (Hymenoptera) Diastrophus cuscutae-formis


Blackberry seed gall on blackberry (Rubus) caused by a cynpid gall wasp (Hymenoptera) Diastrophus cuscutae-formis


Blackberry seed gall on blackberry (Rubus) caused by a gall wasp (Hymenoptera) Diastrophus cuscutae-formis


The swelling on this dusty miller (Senecio) could easily be mistaken for a flower bud but is really a gall caused by a midge (Diptera)


Bud gall on artemisia (Artemisia) caused by a midge (Diptera)


Cross-section of bud gall on artemisia (Artemisia); note, galleries and orange larva of midge larvae that caused the gall (Diptera)


Kidney-shaped stem gall on blueberry (Vaccinium) caused by a wasp (Hymenoptera)


Cross-section of stem gall on blueberry (Vaccinium); note, galleries of wasp larvae (Hymenoptera)


Leaf gall on poison ivy (Toxicodendron radicans)


Azalea twig gall caused by the fungus Exobasidium vaccinii on azalea (Rhododendron)


Azalea twig gall caused by the fungus Exobasidium vaccinii on azalea (Rhododendron)


Flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)


Flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)


Dissected flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)


Flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)

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