Category Archives: galls

Sponge Gall Midge

This gallery contains 6 photos.

One of the most common galls found on tall sagebrush (Artemisia tridentata) is a spongy gall induced by the sponge gall midge (Rhopalomyia pomum).  Tall sagebrush, also commonly called Great Basin or big sagebrush, is found between 4,000 and 10,000 … Continue reading

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Manzanita Leaf Gall Aphid

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In my previous post (see “Manzanita Leaf Fungus” on 08-20-2019), I discussed a manzanita (Arctosstaphylos ssp) gall caused by a fungus. An aphid, the manzanita leaf gall aphid (Tamalia coweni), also induces galls on manzanita shrubs. T coweni has an … Continue reading

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Manzanita Leaf Fungus

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There are more than 50 species of manzanita (Arctostaphylos ssp) in California alone. Two agents induce galls in manzanita species. Exobasidium vaccinii, a fungus, is one of these agents. E vaccinii induces swollen, convex, bright red galls on the dorsal … Continue reading

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Prunus Witches’ Broom

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  Continuing on the bitter cherry (Prunus emarginata) theme: The yeast-like sac fungus Taphrina confusa induces witches’ brooms on several Prunus species. Although the western choke cherry (P virginiana) and Sierra plum (P subcordata) are most often infected, Leonard and … Continue reading

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Oak Apple Gall

This gallery contains 8 photos.

There are over 150 species cynipid wasps that induce galls on California oaks. Barely the size of fruit flies, these wasps cause some of the most exotic plant galls displaying a variety of shapes (conical, spherical, stalked, disc-shaped, spiny, etc.) … Continue reading

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