Rabdophaga salicisbrassicoides
(Packard, 1869)
willow rosette gall midge, willow cabbage gall midge
Rabdophaga salicisbrassicoides is a in the that induces rosette or cabbage-like on willow . Its develop within these galls and overwinter inside them. The species has been observed in association with mutualistic interactions involving Formica neoclara and Chaitophorus on its Salix exigua.
Pronunciation
How to pronounce Rabdophaga salicisbrassicoides: /ræbˈdɒfəɡə sælɪsˌbɹæsɪkoʊˈaɪdiːz/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from other Rabdophaga by the characteristic rosette or cabbage-like on willow . The gall structure differs from the elongated shoot galls or galls produced by related species. identification requires examination of antennal structure and .
Images
Habitat
Associated with willow-dominated riparian areas and wetlands where Salix exigua (sandbar willow) occurs. form on actively growing shoots of willows.
Distribution
Recorded from the United States, including Vermont. Distribution corresponds with that of its primary Salix exigua in western and central North America.
Seasonality
emerge in late April. overwinter within .
Host Associations
- Salix exigua - Primary ; induced on shoots
- Chaitophorus - indirect association present on same plants, involved in with that may benefit
- Formica neoclara - indirect association that tends Chaitophorus on willows; this has been observed to benefit
Life Cycle
develop within rosette on willow shoots. They overwinter inside the gall structure. emerge in late April to initiate the next .
Ecological Role
Acts as a inducer, causing localized growth distortion in willow shoots. The gall structure provides protected for larval development. The has been observed to thrive in association with - on plants.
Similar Taxa
- Rabdophaga rosariaAlso produces rosette on willows; may require gall and details for separation
- Rabdophaga strobiloidesProduces cone-like willow with distinct from the cabbage-like rosettes of R. salicisbrassicoides
More Details
Ant-aphid association
The has been documented to benefit from the mutualistic relationship between Formica neoclara and Chaitophorus on Salix exigua. The mechanism of this facilitation has not been fully described.