Fall Armyworms Remain Active Across Kansas Fields
State agricultural experts warn that armyworm larvae continue to feed on wheat and alfalfa crops.
Updated on Oct. 27, 2026 in Forecasts
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Fall armyworm larvae remain active throughout Kansas as the insects continue feeding on green vegetation. This seasonal activity is expected to persist until the state experiences its first hard freeze of the year.
Why it matters
Active armyworm populations pose a continued risk to emerging wheat and alfalfa crops as other food sources diminish in late autumn. Growers must remain vigilant in monitoring their fields to prevent significant damage until cold weather halts the infestation.
A hard freeze, defined as temperatures reaching the mid-20s˚F, is required to end the armyworm lifecycle. Until then, larvae continue to feed on wheat, alfalfa, and other available green vegetation.
The players
K-State
The institution provides ongoing insect management guidance and research for agricultural producers in Kansas.
The details
Armyworm moths deposit eggs on or near green plants, which hatch into caterpillars that feed on grasses such as corn, sorghum, and turf before moving to broadleaf plants like soybeans. Because insecticide seed treatments are insufficient for control, monitoring fields after wheat germination is critical for management.
Timeline
Late October 2026 marks the current period of armyworm larvae activity in Kansas.
Monitoring of wheat fields for small larvae should commence immediately following germination.
Armyworm feeding activity is projected to potentially continue until mid-to-late November.
Seasonal Patterns
This infestation follows the established pest management protocols documented in K-State's 2026 insect management publication. It mirrors typical late-season activity patterns that occur annually before the arrival of winter weather.
Producers should actively scout wheat fields for small larvae immediately following germination to assess potential damage. Relying on preventative seed treatments is not effective, making regular field inspections the primary defense until a hard freeze occurs.
The takeaway
Fall armyworms do not overwinter in Kansas, meaning the current threat will conclude naturally with the arrival of the first hard freeze. Farmers should focus on immediate crop protection efforts rather than assuming preventative measures will suffice.
Further reading
For additional updates on regional conditions, visit Kansas Forecasts.
Source note: This article includes information reported by Great Bend Post.
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