page_title: Helicoverpa zea
section_title: Eggs
hierarchical_section_title: Helicoverpa zea / Lifecycle and description / Eggs
caption_attribution_description: Helicoverpa zea - Corn Earworm - According to Wikipedia its the second most economically damaging insect pest in North America, chewing on a wide variety of crop plants. This most certainly is true, but it also not a bad looking animal when viewed close up. Perhaps we will take a little more time to think about this species now than have by simply labeling it a problem. Specimens provided by Benzon Research. 15:42, 3 February 2015 (UTC)15:42, 3 February 2015 (UTC){{{{{{0}}}}}}15:42, 3 February 2015 (UTC)15:42, 3 February 2015 (UTC) All photographs are public domain, feel free to download and use as you wish. Photography Information: Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200 Further in Summer than the Birds Pathetic from the Grass A minor Nation celebrates Its unobtrusive Mass. No Ordinance be seen So gradual the Grace A pensive Custom it becomes Enlarging Loneliness. Antiquest felt at Noon When August burning low Arise this spectral Canticle Repose to typify Remit as yet no Grace No Furrow on the Glow Yet a Druidic Difference Enhances Nature now -- Emily Dickinson Contact information: Sam Droege sdroege@usgs.gov 301 497 5840
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.
context_section_description: Eggs are individually deposited on leaf hairs and corn silks (not in reference given). The eggs are initially pale green in color, but over time they turn yellowish and then grey. Eggs are 0.5 mm in height and average about 0.55 mm in diameter. They hatch after 66 to 72 hours of development. Once larvae have breached the chorion, they spend up to 85% of their time emerging from their shell. In this eclosion process, the larvae work to make the exit hole larger than their heads. Larvae spend the rest of the time making a silk meshwork around the exit hole; this both helps them escape the shell and helps them find the shell afterwards so they can feed on it. After feeding on their shell, larvae rest about 3 minutes before they begin feeding on the plant material around them.
caption: Eggs
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