Current status: FAW populations continue to develop across New Zealand. Northland awaits the third main moth flight of the season, with the key time for scouting and decision-making approaching. Maize grain and sweetcorn growers should be particularly vigilant during this period.
Key points
Silage crops: As silage harvest nears, most crops in regions outside the north are unlikely to be significantly affected by FAW.
Sweetcorn and grain risk: Sweetcorn crops are particularly vulnerable at cob development. Larvae may enter via the silks or through the sides of cobs and cause significant damage, necessitating heightened scouting efforts. Maize grain and 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.
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 in West Coast FAW populations. These beneficial insects are widespread across New Zealand and may play a significant role in reducing future FAW populations.
Other maize pests: Helicoverpa armigera (corn earworm) and Mythimna separata (cosmopolitan armyworm) are also present in small numbers. 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
Monitoring critical as third moth flight approaches
The third main moth flight is anticipated in Northland, marking a critical time for scouting and management decisions.
Read more in this week's update here.