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Neodryinus typhlocybae (Ashmead). Use and efficacy in biological control [parasitoid of Metcalfa pruinosa]  [2002]

Mazzon, L. Girolami, V. (Padua Univ. (Italy). Dipartimento di Agronomia Ambientale e Produzioni Vegetali)

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The natural paleartic enemies did not prevent the outbreaks of Metcalfa pruinosa in Europe. Biological control was satisfactorily provided by Neodryinus typhlocybae, which was collected in United States (Connecticut) and introduced in Italy (Veneto) in 1989. The dryinid wasp widespread in Veneto region and now M. pruinosa is no more an economic problem. N. typhlocybae needs some years after introduction before the increase of population is sufficient to control M. pruinosa. N. typhlocybae overwinters as mature larva inside a cocoon on leaves fallen on the ground. The species completes one or two generations per year and the first adults emerge in June, when M. pruinosa reaches the third and fourth juvenile stages. Sex allocation and diapause induction are related with the age of the host: only males emerge from the parasitized third stage, both males and females can develop on fourth stage, but males will be monovoltine and females bivoltine; on fifth instars mostly monovoltine females are produced. A single female of N. typhlocybae can parasitize 60 nymphs and can eat about 50 young stages of M. pruinosa, therefore a female can potentially destroy the offspring of 1-2 females of this planthopper

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Informatore Fitopatologico (Italy)

ISSN : 0020-0735

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