Cottony rosette stem galls on Wyoming big sagebrush

Here are photographs of a rosette gall that I'm trying to identify, all growing on Wyoming big sagebrush (Artemisia tridentata subs. wyomingensis at the Crooked River National Grassland in Madras, Oregon. Galls are between 1 and 4 cm in diameter and are composed of dozens of thin, pointed bracts coated with fine white hairs. There are thousands at the location.

I'm assuming they are some sort of Rhopalomyia (Cecidomiidae), but I can't find a good match in iNaturalist, BugGuide, or on any of the hundreds of web pages and books that document the various galls on sagebrush. Similar galls have also been observed by @ddubois2 on Artemisia cana in Montana (https://www.inaturalist.org/observations/45283788#activity_comment_4818259) and by @serpophaga on Artemisia dracunculus in California (https://www.inaturalist.org/observations/8919705, https://www.inaturalist.org/observations/8919707).

It seems improbable that something so striking is not yet described. If anyone has ideas on what it might be, I'd be grateful for any leads.

Publicado por colinpurrington colinpurrington, 03 de agosto de 2020

Observaciones

Fotos / Sonidos

Observ.

colinpurrington

Fecha

Junio 10, 2020 06:54 AM EDT

Descripción

Cottony rosette gall on Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis).

Fotos / Sonidos

Observ.

colinpurrington

Fecha

Julio 30, 2020 09:59 AM EDT

Descripción

Cottony rosette gall on Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis).

Fotos / Sonidos

Observ.

colinpurrington

Fecha

Julio 30, 2020 10:00 AM EDT

Descripción

Cottony rosette galls on Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis).

Fotos / Sonidos

Observ.

colinpurrington

Fecha

Julio 30, 2020 10:02 AM EDT

Descripción

Cottony rosette gall on Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis). Use of "cottony rosette gall" is not to suggest that's the common name; just descriptive.

Fotos / Sonidos

Observ.

colinpurrington

Fecha

Julio 30, 2020 10:04 AM EDT

Descripción

Cottony rosette gall on Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis).

Insects

Fotos / Sonidos

Qué

Insectos (Clase Insecta)

Observ.

colinpurrington

Fecha

Julio 31, 2020 05:44 PM EDT

Descripción

Orange larva inside a rosette gall on Wyoming big sagebrush. Not sure whether this is the galler (Rhopalomyia?), an inquiline, or a parasitoid. Second pic is larva inside another gall from the same plant — many of the galls in area have these larvae.

Here's one of the galls:

Cottony rosette gall on Wyoming big sagebrush

Insects

Fotos / Sonidos

Qué

Insectos (Clase Insecta)

Observ.

colinpurrington

Fecha

Julio 31, 2020 04:08 PM EDT

Descripción

White larva inside a rosette gall on Wyoming big sagebrush. Not sure whether this is the galler (Rhopalomyia?), an inquiline, or a parasitoid. Second pic is larva inside another gall from the same plant.

Here's one of the galls:

Cottony rosette gall on Wyoming big sagebrush

Comentarios

Hello I'm trying to tag you in my post on inaturalist photos. Please look for me. I'm trying to find out if this is an invasive praying mantis. Thanks. I'm having trouble posting and tagging lol. yvette123

Publicado por billnyvette123 hace más de 1 año (Marca)

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