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Photo#1142747
Double spherical galls, dissected - Eurosta solidaginis

Double spherical galls, dissected - Eurosta solidaginis
Tommy Thompson Park, Toronto, Ontario, Canada
September 16, 2015
Size: large
These galls were on goldenrod (Solidago sp.). Inside the top gall is a larva of the the parasitoid wasp Eurytoma gigantea. That is, a wasp laid an egg into the gall cavity. Then, its larva ate the gall causer larva. Apparently, after that the gall doesn't grow any more.