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New Zealand Plant Protection 66 (2013): 40-44

Eradication programme for four noxious weeds in New Zealand

E.Yamoah, G.S.C. Gill and E. Massey


The Ministry for Primary Industries (MPI) has targeted Salvinia molesta (salvinia), Eichhornia crassipes (water hyacinth), Sorghum halepense (Johnson grass) and Moraea flaccida (cape tulip) for eradication under the national interest pest response (NIPR) programme. These weeds are both notifiable and unwanted organisms under the Biosecurity Act 1993. The NIPR eradication programme consists of educational campaigns; enforcement of the Biosecurity Act, which prohibits propagation, planting, sowing, sale and distribution of the weeds; removal and destruction of the weeds from known infested sites; and monitoring those sites for regrowth. Assessment over the past two decades shows that Johnson grass and cape tulip have responded well to management. As at 2013, the number of active Johnson grass sites has reduced by 100% and cape tulip by 74%. The number of active sites for water hyacinth and salvinia, however, keeps rising and falling, thus prolonging eradication.

Keywords: Eichhornia crassipes, Salvinia molesta, Sorghum halepense, Moraea flaccida, weeds, NIPR.

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