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Posts tagged “Noctua pronuba

Winter Cutworms Active In Winter

One of the last things you expect to see on top of snow is a caterpillar, but it can happen.  Certain species can withstand the cold of northern New England winters and remain active throughout the colder months. Among them is the “Winter Cutworm,” or larval stage of the Large Yellow Underwing Moth (Noctua pronuba), a relatively common Noctuid (a family of moths that typically has dull forewings and pale or colorful hind wings).

These larvae actively feed on the roots and foliage of plants (grasses, weedy plants and a variety of garden vegetables) through the winter, and on warm days can appear on top of the snow.  They pupate and emerge as adults in spring and early summer. (Photo: Winter Cutworm that appears to have been caught short by a sudden drop in temperature.)


Large Yellow Underwing Larvae Crawling On Snow

12-12-16-large-yellow-underwing049a2252The striped caterpillar that is crawling along the surface of fresh snow is the larval stage of a noctuid or owlet moth known as the Large Yellow Underwing (Noctua pronuba). Noctuids are dull-colored, medium-sized, nocturnal moths that are attracted to lights in the summer. They usually possess a well-developed proboscis (mouthpart) for sucking nectar. The Large Yellow Underwing larva is one of many species  known as cutworms that feed on herbaceous plants. Introduced from Europe to Nova Scotia in 1979, this species has since spread north to the Arctic Ocean, west to the Pacific, and south to the Gulf of Mexico.

Larvae sporadically feed through the winter months whenever temperatures are above the mid-40s. The Large Yellow Underwing larva has been nicknamed the winter cutworm and the snow cut-worm for its ability to feed actively when other cutworms are dormant for the winter. Occasionally on warmer winter days, such as we had last week, you see them crawling on the snow.

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