Corylus
Guides
Acronicta falcula
corylus dagger moth, Hazel Dagger
Acronicta falcula is a North American noctuid moth commonly known as the corylus dagger moth or Hazel Dagger. The species was described by Augustus Radcliffe Grote in 1877 and occurs primarily in the northeastern and north-central United States and adjacent Canada. It is associated with Corylus (hazel) species, on which its larvae feed. The species is considered rare in some parts of its range and is listed as a species of special concern in Connecticut.
Agrilus corylicola
Agrilus corylicola is a jewel beetle (family Buprestidae) described by Fisher in 1928. The species is associated with Corylus (hazelnut) host plants, as indicated by its specific epithet. It belongs to the large genus Agrilus, which contains numerous host-specific woodboring beetles. The species has been documented in the eastern United States, with potential occurrence in Missouri suggested by host plant presence, though confirmed records from the state appear limited.
Agrilus pseudocoryli
hazel stem borer
Agrilus pseudocoryli is a metallic wood-boring beetle in the family Buprestidae, commonly known as the hazel stem borer. It develops within stems of hazelnut plants (Corylus spp.), where larval tunneling causes dieback. The species has been documented as a pest of hybrid hazelnut cultivars in the Great Lakes region, with damage severity varying by cultivar. Adult activity occurs from early June to mid-July.
Calligrapha rhoda
Calligrapha rhoda is a leaf beetle in the family Chrysomelidae, occurring in North America. It is part of a genus known for extreme host specificity, with most species feeding on a single plant genus. This species closely resembles Calligrapha spiraeae and Calligrapha rowena in appearance, but is distinguished by its association with hazel (Corylus spp.) rather than ninebark or dogwood. Like other Calligrapha species, it exhibits reddish coloration with small black spots on the elytra.
Empria coryli
Empria coryli is a species of sawfly in the family Tenthredinidae, first described by Dyar in 1897. The species epithet "coryli" suggests a potential association with Corylus (hazelnut), though this relationship has not been confirmed in the available literature. Records indicate occurrence in Quebec, Canada. As with other Empria species, it likely exhibits the typical sawfly characteristic of herbivorous larval feeding on plant foliage, but specific biological details remain poorly documented.
Macrosiphum coryli
American Hazelnut Aphid
Macrosiphum coryli is an aphid species in the family Aphididae, commonly known as the American Hazelnut Aphid. It is a specialist feeder associated with plants in the genus Corylus (hazelnuts). The species was described by Davis in 1914 and is currently accepted as valid, though it has been placed in the subgenus Neocorylobium within Macrosiphum by some treatments. It belongs to a genus of aphids that includes several economically significant species affecting agricultural crops.