Biocontrols refers to biological control agents that are brought in to reduce the vigour and viability of widespread pests. It requires extensive research and careful testing to ensure that only that the target species of weeds are affected.

The most spectacular example has been ragwort, a yellow-flowering pasture weed that is toxic to sheep and cattle and can shade out pasture grassses. The introduction of a combination of biocontrol agents has changed the farming landscape in Tasman from dense groves of ragwort to only a few scattered plants.

The following documents have further information about biocontrols for specific plants

For further information contact the Biosecurity Team, Tasman District Council