Check out the latest fall armyworm update here.
Key points
Current status: FAW populations continue to persist in small numbers across New Zealand. Helicoverpa armigera and Mythimna separata are also present, with notable pest dynamics in areas.
Maize crops: Silage crops and some early grain are being harvested around the country, with minor cob damage reported. Later-planted maize crops in Northland have higher FAW activity, particularly in greener crops.
Sweetcorn: Sweetcorn crops remain vulnerable. Larvae may enter via the silks or through the sides of cobs and cause significant damage, necessitating heightened scouting efforts. Sweetcorn growers should remain proactive in monitoring young populations for potential intervention.
Crop monitoring: Regular field inspections are essential, identifying new populations while they are young and susceptible remains the most effective management approach. Any later planted maize or sweetcorn crops should be the focus.
Identify your pests: For assistance in identifying FAW larvae and damage, contact FAR, refer to resources on the FAR website, or reach out to an agronomist.
Natural controls: Large populations of Cotesia parasitoids have been observed. These beneficial insects are widespread across New Zealand and may play a significant role in reducing future FAW populations. In the Far North Island, large numbers of Lissopimpla excelsa are being spotted patrolling crops and in the North and South, Tasman lacewings have been observed in small numbers in most crops.
Other maize pests: Helicoverpa armigera (corn earworm) and Mythimna separata (cosmopolitan armyworm) are present across the country. These species should be correctly identified to avoid unnecessary interventions.
Communication: Collaboration and information sharing among growers, agronomists, and industry experts are essential to refining management strategies and improving outcomes.