Rhinocyllus conicus (Frölich, 1792)

Coleoptera, Curculionidae

on Carduus, Cirsium

gall

one or more weevil larvae live in the receptacle, feeding on calllus tissue that is induced by their activities; according to Redfern & Shirley the receptacle also sclerifies. Pupation in the receptacle.

The infection can be distinguished externally from the galls of Urophora solstitialis or terebrans because the eggs are deposited exernally, at the base of the involucral bracts, and covered with brown drop of drying secretion.

hostplants

Asteraceae, narrowly oligophagous.

Carduus; Cirsium.

notes

A seemingly identical biology is shown by Larinus planus, possibly even more Larinus species. For a reliable identification breeding is mandatory.

references

Dauphin & Aniotsbehere (1997a), Morris (1982a), Redfern & Shirley (2011a), Rheinheimer & Hassler (2010a).

04/10/2014

mod 28.vi.2017