Dorytomus taeniatus | |
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Dorytomus taeniatus 3-4,5 mm | |
Scientific classification
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Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Coleoptera |
Infraorder: | Cucujiformia |
Family: | Curculionidae |
Subfamily: | Curculioninae |
Genus: | Dorytomus |
Species: | D. taeniatus
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Binomial name | |
Dorytomus taeniatus |
Dorytomus taeniatus is a species of weevil native to Europe. [2] [3] It was first described by Johann Christian Fabricius in 1781. The larvae cause a small growth (known as a gall) on the catkins of willows (Salix species).
Eggs are laid during the autumn in the axils of catkin buds and hatch the following spring. [4] The larvae cause an inconspicuous distortion of, usually, female catkins, thickening the rachis. [5] Catkins drop earlier than uninfected catkins and the larvae pupate in the soil. [6] Close examination of the gall is necessary as Redfern et al. (2011) note that sometimes, thickening of the rachis can be wound tissue rather than a gall and according to Plant Parasites of Europe identification is only possible by examining the weevils. [5] [6]
The gall has been recorded from white willow ( S. alba), eared willow ( S. aurita'), goat willow ( S. caprea), grey willow ( S. cinerea) and purple willow ( S.purpurea). [6]
Adults are 4–5 millimetres (0.16–0.20 in) long and brownish-black to black. They can be found from May onwards, browsing on the leaves, removing patches of tissue and exposing the network of fine veins. [4]
Found in western and central Europe including Great Britain (common) and Scandinavia. [7]