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Metamorphic Development. Metamorphic Development of the Corn Earworm through the Eyes of Sixth Graders. Presented By Amanda Gough, Hannah Kovar, Josef Orsak, Kimberly Wheeler Snook Secondary School Snook, TX Ms. Pamela Romi Donald—Teacher Mr. Robert Reyes—Principal

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metamorphic development of the corn earworm through the eyes of sixth graders

Metamorphic Development of the Corn Earworm through the Eyes of Sixth Graders

Presented

By

Amanda Gough, Hannah Kovar, Josef Orsak, Kimberly Wheeler

Snook Secondary School

Snook, TX

Ms. Pamela Romi Donald—Teacher

Mr. Robert Reyes—Principal

Mr. Jim Copeland—Superintendent

egg larva pupa moth what else
Egg, Larva, Pupa, Moth What Else?

This year the sixth graders at Snook I.S.D. studied and worked with corn earworms. The scientific name for the corn earworm is Helicoverpa zea or Heliothis zea. The corn earworm is also known as the tomato fruitworm, the sorghum headworm, vetchworm, and cotton bollworm. You can see corn earworms in four stages egg, larva, pupa, and moths.

These four stages take many days and even weeks to go through. All you need is a bit of patience to raise some corn earworms.

slide4
EGG
  • First stage of corn earworm metamorphosis.
  • Are yellow at first then turn a gray shade of color, but turn a pale green color when about to change into the larva.
  • Shape can vary from slightly-dome shape to a flattened sphere.
  • Usually laid individually, but in groups of 500 to 3,000 eggs per female moth.
  • Hatch in about two to ten days depending on the temperature.
  • About half the size of a pinhead.

The sixth graders at Snook didn’t find out much about the corn earworm egg but some of my peers did take some pictures of the corn earworm egg.

materials
Materials

Corn Earworm larva

Digital Blue Computer Microscope

Dissecting microscopes

Hand Lens

Paper Towels

Plastic cups with lids

Special Diet

String

Sugar

Two liter bottles

Water

Dentist wick(cotton)

larvae
LARVAE
  • Second stage of the corn earworm
  • Goes through many different colors
  • If left in a container with another corn earworm, the bigger worm will eat the smaller one
  • Sheds at least five skins, will eat first four if not taken out
  • Will grow long and then when ready to turn into the pupa stage it will shrink
  • Will start to flip when ready to turn into a pupa
  • Will bury itself under food when ready to turn into pupa
  • Feeds on many different foods
  • Emits a black liquid that will form the
  • cocoon
slide7
Pupa
  • Third stage of the corn earworm
  • Goes through several different color changes as it matures
  • Is a non-feeding immobile stage
  • Tissue changes from that of a larva to that of an adult
  • When first transformed the pupa is a pearly white color. As it matures it changes to a darker and darker brown
  • When it is soon to emerge from the cocoon it turns a dark black
slide9
Moth
  • The moth is a cream color and has scattered dark spots on its wings.
  • The moth will normally lay 500-3000 eggs.
  • Moths normally migrate in late May.
  • The moth will cost farmers millions of dollars in damage.
slide13
Observing the corn earworm is a delicate process but if you are careful you can have a lot of fun. If you are observant enough, you can learn things you never thought were possible.

From the Snook I.S.D. Sixth Graders,

thanks for inviting us to participate.

acknowledgements
Acknowledgements

Dr. Craig Wilson

Ms. Pamela Donald Teacher

Mr. Jim Copeland Superintendent Snook ISD

Mr. Robert Reyes Principal Snook Secondary School

Mr. Selwyn Smith Technology Coordinator Snook ISD

Ms. Laura Oehler Research Scientist

Parents of

Amanda Gough

Hannah Kovar

Josef Orsak

Kimberly Wheeler

Snook ISD Sixth Graders