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Biorhiza pallida is characterised by 2 generations, an unisexual and an sexual generation. Wingless females emerging from oak root galls oviposit at the end of winter into the buds of oaks. This leads to the development of potato like galls (20-50 mm in diameter) which become brownish when mature (see image above). From these galls winged males and winged or wingless female wasps emerge in June-July. The females oviposit into roots of oaks which lead to the development of 5-25 mm big root galls. B. pallida is widely distributed and common in Europe, North Afrika, and Asia Minor. Their larvae can develop on various species of oak: Q. canariensis, Q. faginea, Q. frainetto, Q. petraea, Q. pubescens, Q. pyrenaica, Q. robur, Q. ilex. |
