Spiny Rose Gall Wasp
Diplolepis bicolor
This record describes Diplolepis bicolor (species). Recorded family: Diplolepididae. Recorded order: Hymenoptera.
Identification and Appearance
Causes galls on rose leaves: Spherical, 7-10 mm. in dia., covered with spines about as long as diameter of the gall, the leaf obliterated if the cluster is large.
Wikipedia reference for Diplolepis bicolor: https://en.wikipedia.org/wiki/Diplolepis_bicolor.
Classification
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Insecta
- Order
- Hymenoptera (Ants, Bees, Wasps and Sawflies)
- Superfamily
- Cynipoidea
- Family
- Diplolepididae (Rose Gall Wasps)
- Genus
- Diplolepis (Rose Gall Wasps)
Imported taxonomy record. Source availability varies; see the source references and editorial policy below.
Habitat and Range
Seasonal Activity
In the Chicago area, galls are full-grown but still succulent at the end of June, turning brown in July. Adults emerge the following May.
About Flies: the wider group
Order-level background for Hymenoptera, the group containing Diplolepis bicolor. Species-specific details appear above.
Group overview
Hymenoptera includes over 150,000 described species of ants, bees, wasps, and sawflies. Earth harbors approximately 20 quadrillion (20×10^15) ants, with a combined biomass of ~12 megatons of dry carbon - exceeding the combined biomass of all wild birds and mammals (PNAS, 2022).
Ecological role of the group
About 35% of the world's food crops depend on animal pollinators. The chocolate industry, valued at over $100 billion, depends on pollinating flies and midges. Ants are the dominant soil engineers in most terrestrial ecosystems, turning more soil than earthworms in many habitats.
Economic and practical significance of the group
Pollinators contribute $235-577 billion worth of annual global food production (FAO). In the U.S., bee pollination alone benefits crops valued at $18 billion annually, and honey bees are responsible for $5.4 billion in agricultural productivity. Between April 2023-2024, 55.1% of managed honey bee colonies were lost. The U.S. bee population dropped from 5 million to 2.5 million.
Recorded sources for this group: FAO, USDA, EPA, PNAS (2022), US Fish & Wildlife Service. Imported estimates may describe particular regions or reporting periods.
Photos of Spiny Rose Gall Wasp (3)
Photo credits: Contributed by Charley Eiseman; Additional contributions by Beatriz Moisset