Skip to main content

armyworm

armyworm, larva of a moth, Pseudaletia unipuncta, found in North America E of the Rocky Mts. When numerous, armyworms move in hordes, traveling by night and devouring grasses, young grains, and some leguminous crops. The full-grown larva is about 2 in. (5 cm) long, dark gray with yellow and green stripes. There are usually two generations in a season, the larvae hatching from eggs in late spring and again in late summer. Pupation (see insect) is underground. The moth is grayish brown with a white spot on each fore wing. Armyworms are sometimes serious pests, especially in the second generation of the summer, which occurs when corn and wheat are maturing. Control methods include the use of poisoned bait and the digging of ditches and holes as traps. The armyworm can also be controlled by toxaphene insecticide, but this chemical is prohibited in most states. Armyworms are classified in the phylum Arthropoda, class Insecta, order Lepidoptera, family Noctuidae.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"armyworm." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 16 Jun. 2019 <https://www.encyclopedia.com>.

"armyworm." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (June 16, 2019). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/armyworm

"armyworm." The Columbia Encyclopedia, 6th ed.. . Retrieved June 16, 2019 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/armyworm

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.