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menziesii and can make the fruit "turn red and swell." The tree is also host to a variety of other pathogenic fungi. Azalea Gall (Exobasidium vaccinii) Marianne Elliott writes that "Blister blight (Exobasidium vaccinii) forms pinkish blisterlike galls that" can distort and twist the leaves of A. Fiddleneck Gall Nematode (Anguina amsinckia) large gall replaces flower head preferential galling of the lowermost flowers (Fl-F6) within a given inflorescence. Schizomyia macrofila See midge-induced flower bud gall Russo reports finding an undescribed aphid that induces leaf-roll galls on serviceberry. Uncommon in California common in some SW states.
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"Horns" of whitish to yellow-orange rust stick out of fruit. Gymnosporangium inconspicuum See photo at bottom of page.
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Taphrina amelanchieri Causes witches' brooms Blaesodiplosis Undescribed species of this midge genus induce a variety of leaf galls on serviceberries. Asphondylia ambrosiae According to Gagne 1975, this midge "forms fuzzy, globose bud galls on Ambrosia spp." See BugGuide photoĪmbrosia psilostachya- Western ragweed: Ragweed Gall Mite (Aceria boycei) Leaf blister Īmbrosia chenopodiifolia - San Diego Bur-Sage: Aceria franseriae Bead galls described by Wilson & Oldfield They occur singly or in small groups on axillary buds, leaves, staminate florets, and the rachis and have been collected from five species of Ambrosia in SoCal. Contarinia partheniicola Per Gagne 1975, "forms whitish, woolly cupulate galls" on Ambrosia spp. Catkin Gall (Dasineura) Another undescribed midge gallĪloe sp & other Asphodelaceae: Aloe gall mite (Aceria aloinis) photos These tiny mites can produce large formations on the plants. Western American Alder Tongue Gall (Taphrina occidentalis) Leaf Fold Gall (Dasineura sp.) Undescribed leaf gall induced by midge Alder Leaf Gall Mite (Acalitus brevitarsus) Leaf blister gall For closeup photos see Bladmineers photos Alder Leaf Gall Mite (Eriophyes laevis) Small, often colorful hemispheric-to-round galls on top of leaf same but hemispheric-to-flat on underside. Īcer negundo- Boxelder : Box elder pouch gall mite (Aceria negundi) pouch galls on leaves Īdenostoma fasciculatum- Chamise: Eriophyes adenostomae Mite-induced leaf "pouch" gall that looks like a conglomeration of puckered beads attached to the slender leaf Īesculus californica- California buckeye: Taphrina aesculi leaf blister witches’ broom Causes witches' brooms, sometimes large, with yellow needles that drop off in the fall. of the gall-roughly as of then-and where they occurred-e.g., SFBA, meaning SF Bay Area.]Ībies sp- Fir: Fir Broom Rust (Melampsorella caryophyllacearum) See USDA info sheet and PNW Handbook entry. To search the list by a host plant's common name, enter F and type the common name. This list is alphabetized by plants' scientific names to keep related plant species together. If you want a visual guide showing all the scientifically described galls iNaturalist members have found in California, just pull up the species list from the Galls of California project. This somewhat idiosyncratic list was begun in mid-2020 to complement, rather than replace, Ron Russo's impressive, 2006 "Field Guide to Plant Galls of California and Other Western States." Accordingly, some galls covered in that book, which was succeeded in April 2021 by Russo's Plant Galls of the Western United States, have been intentionally omitted, out of a sense of indebtedness to the person who has done so much to advance our knowledge of gall-inducing species in this part of the world. For oak gall ID, I recommend perusing Joyce Gross's excellent photo-guide and checking the entry California Oak Galls in this journal to see which oaks host which galls and pick up ID pointers for a few of the oak galls.Ī few incompletely described species that have been identified to the genus level are included here too, but California has a lot of galls that remain undescribed. You'll find some oak, fungus, mistletoe, and bacteria galls listed, but the coverage is spotty. This slowly growing list of nearly 250 plant galls includes all those California gall inducers that had at least 8 observations in iNaturalist's Galls of California project in August 2020 except for oak galls and galls caused by fungi, mistletoes, or bacteria.