page_title: Helicoverpa zea
section_title: Economic impact
hierarchical_section_title: Helicoverpa zea / Economic impact
caption_attribution_description: English: Title: Bulletin Identifier: bulletin4951190405unit (find matches) Year: 1904 (1900s) Authors: United States. Bureau of Entomology Subjects: Insects; Insect pests; Entomology; Insects; Insect pests; Entomology Publisher: Washington&#160;: G. P. O. Contributing Library: Smithsonian Libraries Digitizing Sponsor: Biodiversity Heritage Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: Bui. 50, Bureau of Entomology, U. S. Dept. of Agncultu Plate XIII. Text Appearing After Image: Pupal Cells of the Bollworm. Fig. 1, Pupa of the bollworm in its burrow in the soil, somewhat enlarged; fig. 2, plaster of Paris casts of pupal cells, showing variation in depth and direction, natural size (original). Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
context_page_description: Helicoverpa zea, commonly known as the corn earworm, is a species in the family Noctuidae. The larva of the moth Helicoverpa zea is a major agricultural pest. Since it is polyphagous during the larval stage, the species has been given many different common names, including the cotton bollworm and the tomato fruitworm. It also consumes a wide variety of other crops.
  The species is widely distributed across the Americas with the exception of northern Canada and Alaska. It has become resistant to many pesticides, but can be controlled with integrated pest management techniques including deep ploughing, trap crops, chemical control using mineral oil, and biological controls.
  The species migrates seasonally, at night, and can be carried downwind up to 400 km. Pupae can make use of diapause to wait out adverse environmental conditions, especially at high latitudes and in drought.
caption: 1) Pupa in its burrow in the soil; 2) Casts of pupal cells, showing variation in depth and direction
exif: {}