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Woolly gall wasp (Heteroecus dasydactyli)
The woolly gall wasp (Heteroecus dasydactyli) induces galls exclusively on canyon live oaks (Quercus chrysolepis). The unisexual summer generation galls are hard and spindle-shaped, but are encased by a thick mass of woolly hairs.
A cluster of unisexual summer generation galls induced by woolly gall wasps (Heteroecus dasydactyli) on canyon live oak (Quercus chrysolepis). Calaveras Big Trees State Park, Calaveras County, California.
A single unisexual summer generation gall induced by the woolly gall wasp (Heteroecus dasydactyli). The woolly mass of hair that initially encased the gall has worn away from the hard interior, clearly revealing the exit hole from whence a new cynipid wasp has emerged. Calaveras Big Trees State Park, Calaveras County, California.
Next Gall: Beaked twig gall wasp (Disholcaspis plumbella)
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All images copyright Timothy Boomer. All rights reserved worldwide.