Fall armyworm numbers continue to rise as the season progresses, with the top half of Northland in particular beginning to see levels that would require chemical intervention. Read more in this week's update.
Key points
Current status: FAW populations are increasing, with notable infestations in Northland requiring chemical control. Waikato, Taranaki, and South Island regions are reporting FAW activity, though most crops are at reduced risk due to their advanced growth stages.
The next few weeks are likely to be challenging for growers, particularly in northern regions. If needed, reach out to neighbours, industry representatives, or FAR for support and advice.
Sweetcorn 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.
Crop monitoring: Regular field inspections are essential, especially in regions with known FAW activity. Identifying early instar larvae provides the best window for control measures.
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: Beneficial insects remain crucial in managing FAW populations. Predators and parasitoids significantly reduce larval survival rates. Supporting natural enemies by minimising unnecessary insecticide use is recommended.
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 among growers, agronomists, and industry experts remains vital. Sharing field observations can help refine management strategies.