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Montana Field Guide

Montana Field Guides

A Noctuid Moth - Mythimna unipuncta

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
The Mythimna unipuncta wingspan is 35 - 47 mm. The forewing is tan, and often tinged with orange and lightly speckled with black. The postmedian line is a series of small widely-spaced black dots. The discal spot is white. A black-shaded line slants inward from the apex. The hindwing is grayish-brown with a tan fringe (Powell and Opler, 2009).

The Mythimna unipuncta larvae has a pale brown head with green tinge and mottled with dark brown. The larvae body is smooth, almost hairless, variably yellowish-green to brown to dark gray, and with several dark stripes interspersed with pale lines along top and sides (Powell and Opler, 2009).

Mythimna unipuncta adults fly from March to November in the south, and April to October in the north (Powell and Opler, 2009).

Range Comments
Mythimna unipuncta occurs throughout North America except in the arctic (Alaska, Yukon, Northwest Territories, Nunavut). It also occurs in many other areas of the world (Powell and Opler, 2009).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Mythimna unipuncta prefers fields, gardens, meadows, and waste places (Powell and Opler, 2009).

Food Habits
Mythimna unipuncta larvae are generalist feeders on many species of plants including alfalfa, corn and other grains. They also feed on grasses, vegetables, many weeds and other wild plants, the leaves of fruit trees, and ornamentals (Powell and Opler, 2009).

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A Noctuid Moth — Mythimna unipuncta.  Montana Field Guide.  .  Retrieved on , from