Description
The gall is a pear-shaped swelling about long on a young shoot. The swelling is broader than that of the gall of '' R. karschi'' and contains individual larva in separate chambers that run together. The similar looking gall of ''R. pierreana'' only has one large chamber containing red larvae, while the larvae of ''dubiosa'' are yellow or light orange. Pupation takes place in the gall and the pupa does not have a tooth near the base of the antenna. In Britain, the gall has been recorded on eared willow ( ''S. aurita'') and creeping willow ( ''S. repens''). Elsewhere the gall has been found on ''S. alba'', ''S. caprea'', ''S. cinerea'', ''S. foetida'', ''S. helvetica'' and ''S. purpurea''.Distribution
Found in the Czech Republic, Finland, Great Britain and RomaniaReferences
dubiosa Nematoceran flies of Europe Gall-inducing insects Insects described in 1913 Taxa named by Jean-Jacques Kieffer Willow galls {{Bibionomorpha-stub