The mistflower gall fly (Procecidochares alani): this was approved to control mistflower (a serious weed in conservation areas in Northland) in November 2000.

The hieracium gall fly (Macrolabis pilosellae), the root-feeding hover fly (Cheilosia urbana) and the crown-feeding hover fly (C. psilophthalma): approved to control hawkweed in June 2001.

The boneseed leafroller: this was approved in February 2005 to control boneseed – a significant weed in conservation areas.

The buddleia leaf weevil: approved to control the weed pest buddleia (a weed of forestry plantations) in November 2005.

The ragwort crown borer (Cochylis atricapitana) and the ragwort plume moth (Platyptilia isodactyla): approved to control ragwort (a serious weed affecting pastoral farming) in December 2005.

The mite (Aceria genistae), the broom shoot moth (Agonopterix assimilella) and broom leaf beetle (Gonioctena olivacea): were approved to control the weed broom in July 2006.

A beetle (Cassida rubiginosa) and a weevil (Ceratapion onopordi): these were approved in April 2017 to control the weed Californian thistle.

In November 2008 a beetle from Brazil (Neolema ogloblini) was approved to control the weed tradescantia[SC8] . In June 2011 two more beetles from Brazil, Neolema abbreviata and Lema basicostata, were approved to control tradescantia.

In January 2013 the yellow leaf spot fungus Kordyana sp. was also approved to control tradescantia[SC10] .

The lace bug (Gargaphia decoris) was approved to control woolly nightshade (a weed which forms dense canopies that prevent the establishment of other species) in September 2009.

The plant fungal pathogen Uromyces pencanus was approved as a biological control agent for the emerging weed Chilean needle grass in June 2011. This approval has lapsed.

Two rust fungi Puccinia lantanae and Prospodium tubuculatum, were approved to control the weed Lantana camara in April 2012.

Two weevils, Anthonomus kuscheli and Berberidicola exaratus were approved to control the weed Darwin's barberry (Berberis darwinii) in October 2014.

Privet lace bug (Leptophya hospita) was approved as a biological control agent for the weed privet (Ligustrum spp.) in May 2015.

The Honshu white admiral butterfly (Limenitis glorifica) was approved to control the weed Japanese honeysuckle (Lonicera japonica) in August 2013. The honeysuckle stem-boring beetle (Oberea shirahatai) was approved for release in July 2015.

Colaspis argentinensis was approved for the control of moth plant (Araujia hortorum) in December 2011. The rust fungus Puccinia araujiae was approved as the second biocontrol agent for moth plant in December 2015. 

A weevil Grypus equiseti was approved to control field horsetail (Equisetum arvense) in May 2016.

Two agents were approved for the biological control of tutsan, a moth (Lathronympha strigana) and a beetle (Chrysolina abchasica) in May 2016.

The arundo galling wasp (Tetramesa romana) and the arundo scale insect (Rhizaspidiotus donacis) were approved for the control of giant reed (Arundo donax) in January 2017.