Plant Parasites of Europe

leafminers, galls and fungi

Rhynchites bacchus

Rhynchites bacchus (Linnaeus, 1758)

pesch weevil

on woody Rosaceae

Rhynchites bacchus on Prunus cerasifera

Prunus cerasifera, Hongarije, Budapest, Arboretum, 23.iv.2014 © László Érsek: prenuptial fight

Rhynchites bacchus on Prunus cerasifera

copulation

Rhynchites bacchus on Prunus cerasifera

already during the copulation the female starts making an oviposition chamber

Rhynchites bacchus on Prunus cerasifera

oviposition

Rhynchites bacchus on Prunus cerasifera

rhe clutch is covered with chewed plant mateiral.

parasite

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.

host plants

Rosaceae-Amygdaloideae, oligophagous

Cotoneaster; Crataegus; Cydonia; Malus; Prunus domestica, persica, spinosa; Pyrus.

phenology

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

(PESI, 2019).

notes

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.

references

Braunert (2017a), Dieckmann (1974a), Legalov & Friedman (2007a), Rheinheimer & Hassler (2010a), Yunakov, Nazarenko, Filimonov & Volovnik (2018a).

Last modified 17.vii.2022