Fall armyworm (Spodoptera frugiperda) is a highly invasive plant pest first detected in New Zealand in February 2022. Fall armyworm (FAW) larvae can feed on over 350 plant species and in New Zealand, the crops at most risk are sweetcorn and maize. This update outlines the pest's biology and behaviour and provides tips for identifying and managing fall armyworm in maize and sweet corn crops.
Key points
- Fall armyworm (FAW) is a highly invasive plant pest whose larvae can feed on over 350 plant species. In New Zealand, the crops at most risk are sweetcorn and maize.
- Fall armyworm was first detected in New Zealand in February 2022 and by April 2023, eradication was deemed unlikely and focus shifted to industry-led long-term management.
- Management decisions for FAW should be based on damage and economic thresholds.
- Natural predators provide a level of control and the insecticide Sparta™ is on label for use against FAW.