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  • Fall Armyworm Update 4 April 2025

Fall armyworm update: 4 April 2025

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04 April 2025
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Find out regional information on Fall armyworm as of April 4 2025.

FAW populations continue to be found across New Zealand, primarily impacting late-planted maize and some sweetcorn crops.

Maize crops: Most silage crops have been harvested or are nearing harvest completion. Late-planted maize crops are experiencing increased FAW activity, with some significantly impacted. Unharvested grain crops do not appear to be severely impacted by FAW. Growers with later planted, greener crops should be vigilant and conduct regular scouting to manage pest presence effectively.

Sweetcorn: Sweetcorn crops across the country remain at risk from FAW, as larvae can enter cobs through silks or directly through the sides. Regular inspections and prompt management actions continue to be necessary.

Regional overview for 2024/25 season
Northland
Most crops are harvested, although later planted crops continue to be impacted. Moths are still being caught. Please report any observations of FAW in the absence of maize.

Auckland and Waikato

FAW populations remain low, with no significant threat to maize crops. Sweetcorn growers should continue regular scouting.

Bay of Plenty and Gisborne

FAW populations are present, but at low levels. Silage and grain crops are nearing harvest and are unlikely to be negatively affected. Sweetcorn growers must remain vigilant and consult local agronomists if needed.

South Island (Tasman, Marlborough, Westland)

While corn earworm (Helicoverpa armigera) is the predominant pest, with high infestation levels observed in some crops, FAW remain persistent in these regions. Populations from continually monitored paddocks are at late instar or early pupal stages. Sweetcorn growers in these regions should continue to scout crops as often as possible.

Crop monitoring: Continued vigilance and regular scouting are crucial. Recent trap monitoring indicates declining moth flights in the far north, although ongoing observations in many regions indicate FAW activity despite a decrease in maize availability. Pupae found in monitored crops confirm short-term forecasts from SFFF modelling.

Read more in the full update here.

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  • Fall armyworm update 4th April 2025 278.411 KB

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