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.

Other images

Click for larger image
Burl on oak (Quercus)
Click for larger image
Azalea gall caused by the fungus Exobasidium vaccinii, shown here on azalea (Rhododendron), can also infect plants in the genus Vaccinium
Click for larger image
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)
Click for larger image
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)
Click for larger image
These leafy rosettes on goldenrod (Solidago), called goldenrod bunch galls, are caused by a tephritid fruit fly (Diptera--Procecidochares atra))
Click for larger image
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)
Click for larger image
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
Click for larger image
Rosette gall caused by the midge Rhopalomyia solidagninis (Diptera) on Canada goldenrod (Solidago altissima) with an unknown rust
Click for larger image
White blister galls on goldenrod (Solidago) caused by a midge (Diptera), Asteromyia carbonifera
Click for larger image
White blister galls on goldenrod (Solidago) caused by a midge (Diptera), Asteromyia carbonifera
Click for larger image
Close-up of white blister gall on goldenrod (Solidago) caused by a midge (Diptera), Asteromyia carbonifera
Click for larger image
Blackberry seed gall on blackberry (Rubus) caused by a gall wasp (Hymenoptera) Diastrophus cuscutae-formis
Click for larger image
Blackberry seed gall on blackberry (Rubus) caused by a cynpid gall wasp (Hymenoptera) Diastrophus cuscutae-formis
Click for larger image
Blackberry seed gall on blackberry (Rubus) caused by a gall wasp (Hymenoptera) Diastrophus cuscutae-formis
Click for larger image
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)
Click for larger image
Bud gall on artemisia (Artemisia) caused by a midge (Diptera)
Click for larger image
Cross-section of bud gall on artemisia (Artemisia); note, galleries and orange larva of midge larvae that caused the gall (Diptera)
Click for larger image
Kidney-shaped stem gall on blueberry (Vaccinium) caused by a wasp (Hymenoptera)
Click for larger image
Cross-section of stem gall on blueberry (Vaccinium); note, galleries of wasp larvae (Hymenoptera)
Click for larger image
Leaf gall on poison ivy (Toxicodendron radicans)
Click for larger image
Azalea twig gall caused by the fungus Exobasidium vaccinii on azalea (Rhododendron)
Click for larger image
Azalea twig gall caused by the fungus Exobasidium vaccinii on azalea (Rhododendron)
Click for larger image
Flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)
Click for larger image
Flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)
Click for larger image
Dissected flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)
Click for larger image
Flower bud gall on rudbeckia (Rudbeckia laciniata), possibly caused by a midge (Asphondylia rudbeckiaeconspicua)