Rhynchites bacchus (Linnaeus, 1758)
on woody Rosaceae
The adult beetles feed in the spring on buds, flowers and young fruits. The female deposits an egg in a young fruit, then severs the fruit stalk. The larva develops in the soon rottin fallen fruit. Once full grown it enters the soil.
After the larva has entered the soil, it mostly enters diapause until the spring of th second year. Only then follows the pupation and, after about two weeks, the imago.
distribution within Europe
The fallen fruit generally is soon colonised by the fungus Monilinia fructigena. Dieckmann assumes that not only this is favourable for the larva, but even that the fungus is actively dispersed by the beetles.
Dieckmann (1974a), Legalov & Friedman (2007a), Rheinheimer & Hassler (2010a).