Oregon Agriculture in the Classroom Logo



Importance to Oregon

Sweet corn is the 19th commodity on the Oregon Top 20 Commodity List! The monetary value of sweet corn was almost $44.5 million in 2018! There are two different kinds of corn that are grown in Oregon, one of which is used as a grain in things like livestock feed and the other is Sweet Corn which is what you and I see in the grocery store! The record amount of sweet corn produced in Oregon is 452,330 tons in 1995!

History of Corn

Corn originated in the Americas and has since become one of the most widely dispersed crop of all of the world’s food crops. Early farmers domesticated corn 10,000 years ago in modern day Mexico. The original plant that was domesticated is known as “teosinte”, the ancestor of modern-day corn. The corn grown today, does not look anything like it’s ancestor from 10,000 years ago. The size of corn cobs now is 1000 times larger than the original plant.

Corn is used for a variety of different products like ethanol, turned into high fructose corn syrup, livestock feed and for human consumption

Types of Corn

Sweet Corn

As Native American farmers continued to breed different varieties of plants, they started to notice that some were sweeter than others. Sweet corn is the product of a recessive gene that controls the degree of conversion from starch to sugar.

Field Corn

Field corn does not have the same sweet taste as sweet corn and is instead harvested after it is dried. The hard kernels and high starch content is not as favorable to humans as sweet corn.

Life Cycle of a Corn Stalk

Watch this awesome animated video of the life cycle of a corn plant!



Corn is harvested when the husks start to turn brown and fall off. The ears of corn are firm and the kernels have a creamy white color to them when they are broken open. Harvesting corn too late with reduce the product quality.  Watch the video below to see corn being harvested on a commercial level!

The machinery used for harvesting corn depends on the size of the corn fields. Once the corn has finished growing, combines are used to harvest the ears of corn. Like the video shows, the combine has row dividers that pick up the corn stalks and separates the stalks from the ears. The combine moves continuously through the fields and the stalks are picked up the entire time. The ears are kept on a conveyor belt and the stalks are dropped back on the ground.

Pests and Diseases

Root Worm

Corn seed root worm (adult) feeds on corn silk which impacts the pollination of corn for the next seed yield. There are many different kinds of chemical insecticides that can be used to manage this worm. When applying any kind of pesticide or insecticide it is extremely important to ensure that you read and understand what other insects could be harmed by the use of the chemical.

Common Rust

Common rust is a fungus that occurs every growing season. A variety of corn that is not affected by this fungus is hybrid corn. Common rust appears as flecks on the actual corn leaf surface. The leaf will turn yellow and will eventually die if the rust appears. As the leaf continues to grow the red spots turn black. This fungus can affect the husks, leaves and stalks. This fungus can be transported by wind.


Livestock Feed


Corn Oil

Corn on the Cob

Vocabulary Terms

Parent plants of modern corn.

Characteristics that are transferred from parents to offspring. In this case, the corn gets its characteristics from its parent plants.

A colorless flammable liquid which is produced by breaking down of sugars.

A substance used for killing insects.

Substance used for killing insects or other organisms harmful to plants or animals.

AITC Resources

Corn - An A to Z Book

Making Bioplastics

Here are a couple of our resources regarding corn but if you are interested in taking a look at all of the wonderful books and kits we have please click the link below!