Home / Noctuid Moths (Noctuidae) / Miller Moth/Army Cutworm (Euxoa auxiliaries)

Miller Moth/Army Cutworm (Euxoa auxiliaries)

Miller moth is the adult form of the army cutworm that is the latter’s larval stage. They are indigenous to North America, with the larvae being infamous for consuming canola and alfalfa.

Miller Moth

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Scientific Classification


  • Family: Noctuidae
  • Genus: Euxoa
  • Scientific Name: Euxoa auxiliaries

Description and Identification

Caterpillar

The larvae have a greenish-grey or greenish-brown body with a brown line running through its body and white splotches. Its brownish-gray head has pale brown spots all over. If threatened or disturbed, these larvae curl up, forming a C-shaped structure. They have an overall length of about 4 cm.

Miller Moth Caterpillar

bugwoodcloud.org

Army Cutworm Caterpillar

cropwatch.unl.edu

Pupa

The larva grows by spring and makes burrows in the soil where the pupation stage takes place. The pupal phase occurs between March and May and lasts from three to six weeks.

Miller Moth Pupa

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Adult Moth  

Sexual Dimorphism: Present

Males appear brownish, while females are gray.

Color and Appearance:

Forewings: When opened, it appears dark grayish-brown with markings resembling a kidney bean all over. When closed, the color remain the same with fewer markings visible.

Hindwings: When opened, it has a light grayish-brown coloration with wavy white lines. When closed, the color and pattern remains the same.

Average Wingspan: 3.81 – 4.44 cm

Flight Pattern: Consistent

Season: May – July

Euxoa auxiliaries

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Egg

The eggs appear small, looking like white beads laid under leaves in rows or masses. They hatch into larvae in 8 – 10 days.

Quick Facts

DistributionThroughout North America
HabitatWheatfields, gardens
PredatorsGround beetles, birds, bats
Lifespan of AdultsOne month
Host PlantsAlfalfa, canola, barley, oats, mustard, field corn, canola, sugar beat
DietNectar of wildflower

Did You Know

  • They are a seasonal pest primarily seen in Kansas, New Mexico, Colorado, and Wyoming in spring, while in summer, they go to higher elevations.
  • These moths get their name because the fine scales they have on their wings may easily be rubbed similar to the dusty flour covering a miller’s clothes.
Army Cutworm Moth

extension.usu.edu

Army Cutworm

bugguide.net

Miller Moth Picture

uwyo.edu

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