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Paropsis charybdis, the most serious pest of Eucalyptus in New Zealand, was controlled with the introduced Australian egg parasitoid Enoggera nassaui in the late 1980s. Using frass traps to monitor P. charybdis populations, we report that pest outbreaks still occur, resulting in heavy defoliation of susceptible Eucalyptus species. The results suggest that the presence of large larval populations and commensurate defoliation result from poor spring parasitism by the parasitoid. A second wave of P. charybdis oviposition is effectively attacked, preventing late season defoliation by larvae. A climatic mismatch of E. nassaui is suspected to be the cause of this poor performance.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

<i>Paropsis charybdis</i> defoliation of <i>Eucalyptus</i> stands in New Zealands central North Island