Tassel Ears in Corn (2024)

Tassel Ears in Corn (1)

October 2019
URL: http://www.kingcorn.org/news/timeless/TasselEars.html
R.L. (Bob) Nielsen
Agronomy Dept., Purdue Univ.
West Lafayette, IN 47907-2054
Email address: rnielsen at purdue.edu
Twitter: @PurdueCornGuy

Tassel Ears in Corn (2)eems like every year some fellow walks into the Chat 'n Chew Cafe carrying an odd-looking tassel that is part tassel and part ear to show off to the guys over at the corner table. Much discussion always ensues over the causes of tassel ears, but the usual consensus is that it falls into the general category of corny oddities and is rarely a yield-influencing factor.

The male and female reproductive organs of a corn plant are contained in physically separate unisexual flowers (a flowering habit called "monoecious" for you trivia fans.) The tassel represents the male flower on a corn plant, while the ear shoots represent the female flowers. Interestingly, both reproductive structures initiate as perfect (bisexual) flowers, containing both male and female reproductive structures. Soon after each each reproductive structure has initiated, the female components (gynoecia) of the tassel and the male components (stamens) of the ear shoots abort, resulting in the unisexual flowers (tassels and ears) we come to expect.

Once in a while, some or many of the female flower parts survive and develop on the tassel, resulting in individual kernels or partial ears of corn in place of part or all of the tassel. The physiological basis for the survival of the female floral parts on the tassel is likely hormonally-driven, but the environmental "trigger" that alters the hormonal balance is not known. There are also known genetic mutations that alter normal tassel development by allowing the female flower components to survive.

A "tassel ear" is an odd-looking affair and is found almost exclusively on tillers or "suckers" of a corn plant along the edges of a field or in otherwise thinly populated areas of a field. It is very uncommon to find tassel ears on the main stalk of a corn plant.

Without a protective husk covering, the kernels that develop on tassel ears are at the mercy of weathering and hungry birds. Consequently, harvestable, good quality, grain from tassel ears is rare.

Some folks lump the tassel ear symptom into the same category as the malformed tassel symptom of the so-called "crazy top" disease. These two odd tassel symptoms are not related and, in fact, look totally different. The "crazy top" disease is caused by infection of young corn plants during ponding events by the soil-borne fungus Sclerophthora macrospora that eventually expresses itself by altering normal tassel development (and sometimes ear shoot development) into a mass of leaf tissue.

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Related Reading

Bonnett, O.T. 1948. Ear and Tassel Development in Maize. Annals of the Missouri Botanical Garden 35:269-287, Missouri Botanical Garden Press. https://www.jstor.org/stable/pdf/2394693.pdf [URL accessed Oct 2019]

Cheng, Ping-chin and Dayaker R Pareddy. 1994. Morphology and Development of the Tassel and Ear. in Freeling & Walbot, eds., The Maize Handbook, pp 37-47. Springer-Verlag, New York, Inc.

Iriarte, Fanny and Alison Robertson. 2009. Signs of Crazy Top in Corn. Integrated Crop Management News, Iowa State Univ. Extension. http://www.extension.iastate.edu/CropNews/2009/0706robertsoniriarte.htm [URL accessed Oct 2019].

Luft, Nanticha. Date unknown. Tassel Ears in Corn. Crop Focus, Pioneer Seeds. https://www.pioneer.com/us/agronomy/tassel-ears-cropfocus.html [URL accessed Oct 2019]

Nielsen, R.L. (Bob). 2003. Tillers or “Suckers” in Corn: Good or Bad? Corny News Network, Purdue Univ. http://www.kingcorn.org/news/articles.03/Tillers-0623.html. [URL accessed Oct 2019].

Pioneer. 2017. Do Corn Tillers Hurt or Help Yields? GenTech Seeds Pty Ltd, Australia. https://www.pioneerseeds.com.au/corn-silage/product-information/silage-technical-insights/do-corn-tillers-hurt-or-help-yields.html [URL accessed Oct 2019]

Sweets, Laura. 2011. Crazy Top of Corn. Integrated Pest & Crop Management, Univ of Missouri Extension. http://ipm.missouri.edu/ipcm/2011/5/Crazy-Top-of-Corn [URL accessed Oct 2019].

Thomison, Peter. 2017. Does Tillering Impact Corn Yield? Agronomic Crops Network, Ohio State University Extension https://agcrops.osu.edu/newsletter/corn-newsletter/2017-24/does-tillering-impact-corn-yield [URL accessed Oct 2019].

Thomison, Peter, David Lohnes, Allen Geyer, and Marguerite Thomison. 2015. Tassel Ears. Troubleshooting Abnormal Corn Ears, Ohio State Univ. Extension. https://u.osu.edu/mastercorn/tassel-ears/ [URL accessed Oct 2019]

Tassel Ears in Corn (2024)

FAQs

Tassel Ears in Corn? ›

A corn plant is monoecious, meaning that the male and female reproductive organs are contained in physically separate morphologies. The tassel is the male flower and the ear shoots are the female flowers, both originally initiating as single flowers containing both male and female reproductive structures.

What causes tassel ears in corn? ›

Tassel ears are often produced by tillers that result when the plant's growing point is destroyed or injured by hail, wind (green snap), animal feeding, frost, flooding, herbicides, and mechanical injury.

What do tassels on corn mean? ›

The tassel represents the male flower on a corn plant, while the ear shoots represent the female flowers. Interestingly, both reproductive structures initiate as perfect (bisexual) flowers, containing both male and female reproductive structures.

Should I cut the tassels off my corn? ›

It is VERY IMPORTANT to pull tassels in a timely matter. They must not be allowed to produce pollen. If this happens it can ruin the crop. The tassels are pulled straight out of the top of the corn plant, leaving all the leaves with the plant.

How long after corn tassels do ears form? ›

After corn silks are fertilized by the tassels at the top of the stalk, they'll shrivel up as the ears mature. This happens about three weeks after the silks form. The corn kernels become ripe just about the same time as the silks become brown and shriveled.

What happens if you don't detassel corn? ›

If you don't remove the tassel, the pollen from the tassel will eventually fall onto the silks below, a process called self-pollination. Removing the tassel ensures the plant is pollinated by corn in adjacent rows rather than by itself, creating a hybrid.

Does corn stop growing when tassels? ›

VT Stage. Vegetative growth stages in corn cease with the production of a tassel, VT. This stage occurs when a tassel is fully extended (figure 5 and figure 6) prior to the production of silks (figure 7). Tassels will be visible for approximately two to three days before the formation of silks.

Do you fertilize corn when it tassels? ›

Trials applying nitrogen as late as tasseling show that this can still be very effective, but after tasseling application has yielded mixed results.

Why do farmers remove tassels from corn? ›

It is detasseling, and it's a process used by seed corn companies to produce high-quality products for their customers. In the very simplest of terms, detasseling involves removing the tassel at the very top of the corn plant, mechanically and by hand, to prevent unwanted pollination.

Why does my corn have tassels but no silks? ›

Ear/silk formation follows tasseling after about 2-5 days. If you don't have tassels yet, ears won't be there yet. If you have tassels, and pollen has been falling without any ears/silks formed to catch the pollen, there will not be any corn.

Why is it necessary to detassel corn? ›

Why do farmers detassel corn? Each corn plant has a spikey top filled with pollen called a tassel. Farmers sometimes remove the tassel, a process called detasseling, from some corn plants to control pollination. Corn detasseling allows farmers to make sure that one variety of corn pollinates another.

How long to harvest corn after tassels? ›

As a guide, corn should be ready around three weeks after the silky tassels first appear. However, you should always wait until the tassels are brown, then peel back the covering to expose some kernels and press using a fingernail. If you are too early, the sap will still be clear, so wait.

Do kids still detassel corn? ›

Removing the tassel eliminates unwanted random cross-breeding. For decades, nearly all corn was detasseled by hand. Precision machines introduced in the last few years now detassel 80% of the corn. The other 20% is still done by people – mostly kids.

How do I know when to pick my corn? ›

It takes about 20 days after the silks first appear on the ear before the corn has developed enough. Ears will be ready to pick when the silks turn brown, but the husk remains green. Stalks should have at least one ear near the top before harvesting occurs.

How long does it take corn to pollinate after tassel? ›

The tassel is usually fully emerged and open before any pollen is shed. The length of pollen shed for each plant varies, but is usually 5 to 8 days with the peak production coming about the third day. It is estimated that each tassel will produce between 2 million and 25 million pollen grains.

What month is corn ready to harvest? ›

Corn is typically harvested in late summer or early fall, between August and October in the Northern Hemisphere. Harvesting time depends on factors such as corn type, planting date, climate, and corn maturity, which farmers monitor by observing kernel moisture, color, and texture to determine the ideal time to harvest.

Why do corn cobs have tassels? ›

The main function of tassels in corn cob is to disperse pollen grains. Corn cob is a bisexual plant. The corn cob has long tentacles, which help the pollen grains to spread through the flow of air.

Why do farmers cut the tassels off corn? ›

It is detasseling, and it's a process used by seed corn companies to produce high-quality products for their customers. In the very simplest of terms, detasseling involves removing the tassel at the very top of the corn plant, mechanically and by hand, to prevent unwanted pollination.

Why does my corn plant have tassels but no ears? ›

If the planting is too thick, ears may not develop, even if the corn has tasseled. There are different maturity groups in corn, i.e. different varieties require different length of time from plant emergence to tasseling, and ultimately pollination and ear growth.

What is the fungus on corn tassels? ›

Corn smut is a fungal disease that causes swellings (galls) on ears, leaves, stalks, and tassels of sweet and field corn. Smut is rarely observed in Utah and is not considered economically important for grain production.

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