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Biocontrol introduction

Target pest: Clematis vitalba (Ranunculales: Ranunculaceae), old manís beard

Agent introduced: Monophadnus spinolae (Hymenoptera: Tenthredinidae), old man's beard sawfly

Imported: 1997, 1998, 1999

Import source: Austria, 1997; Switzerland, 1998, 1999

Released: 1998

Release details: Gourlay (2007) - released widely (details unknown) from 1998, but at limited number of sites as difficult to rear. Landcare Research (2016d) - 16 releases were made at 14 sites from Bay of Plenty to Otago, by far the largest being nearly 3,000 individuals at a site near Nelson in 2002.

Establishment: Gourlay (2007) - no signs of establishment recorded. Landcare Research (2014c) - probably failed to establish. Landcare Research (2016d) - surviving release sites checked; found only at Nelson site and rare even there (3 larvae, 1 adult found). Population may be inbred, and predatory vespid wasps are likely to be a limiting factor in New Zealand. Landcare Research (2017g) - only established in low numbers at one site in Nelson. More material will be imported in 2017 in an attempt to establish this insect more widely.

Impacts on target: Landcare Research (2016i) - has only established at one site in Nelson where it still appears to be rare and having no obvious impact.

General comments: Landcare Research (2016d) - merits of attempting to establish the sawfly again considered. Initial step was to check release sites once more (see details under "Establishment"). Recommended against further releases as vespid wasps likely to be limiting factor in New Zealand.

References

Gourlay H (2007). Old Man's Beard Saw Fly. In The Biological Control of Weeds Book (Landcare Research) http://www.landcareresearch.co.nz/research/biocons/weeds/book/documents/Old_Mans_Beard_Sawfly.pdf

Landcare Research (2007). New Zealand Arthropod Collection (NZAC) Biological Control Voucher Collection. http://www.landcareresearch.co.nz/resources/collections/nzac/holdings/biological-control-voucher-collection

Landcare Research (2014c). Who's who in biocontrol of weeds? What's new in biological control of weeds? 69: 10-11 http://www.landcareresearch.co.nz/publications/newsletters/biological-control-of-weeds/issue-69

Landcare Research (2016d). What's happening with old man's beard? Weed Biocontrol: What's New? 76: 4-5 http://www.landcareresearch.co.nz/publications/newsletters/biological-control-of-weeds/issue-76

Landcare Research (2016i). Who's who in biological control of weeds? Weed Biocontrol: What's New? 77: 10-11 http://www.landcareresearch.co.nz/publications/newsletters/biological-control-of-weeds/issue-77

Landcare Research (2017g). Who's who in biological control of weeds? Weed Biocontrol: What's New? 81: 10-11