Weed of the Month: Morningglories

  • MorninggloriesCommon name: Pitted morningglory, tall morningglory, ivyleaf morningglory
  • Scientific name: Ipomoea lacunosa, Ipomoea purpurea, Ipomoea hederacea
  • Grass or broadleaf: Summer annual broadleaf
  • Native to the United States, and widespread across the country
  • Except for the palm leaf morningglory, the first two morningglory leaves that emerge are butterfly-shaped.
  • Morningglory species can be identified by leaf shape, leaf hairs and flower color. Tall morningglory and ivyleaf morningglory produce purple or bluish-purple flowers, while pitted morningglory produces smaller, white flowers.
  • The weed produces large, hard seeds with an impermeable seed coat, making it tough to control.
  • Although there are no confirmed cases of herbicide resistance in morningglories, a tolerance to glyphosate has been documented.1

Fast Facts

  • A single tall morningglory plant per row foot can potentially cut soybean yield in half.1
  • Depending on the species, each morningglory plant can produce as many as 15,000 seeds.1
  • According to the Southern Weed Science Society, morningglories have been listed among the most common and most troublesome weeds for soybean growers in the organization’s weed surveys dating back to 1973.2

A fact that may surprise you …

  • Despite being considered a troublesome weed by farmers, morningglories are prized by gardeners for their colorful, trumpet-shaped flowers.

Morningglory control/management tips

Applying herbicides before planting and/or preemergence can provide good-to-excellent control of the morningglory species often found in crop fields. Postemergence herbicide applications are also recommended to control heavy infestations. In addition, planting in a narrow-row system to close the canopy more quickly can inhibit weed growth by decreasing sunlight available to the germinating morningglory plant. 

“In corn, morningglory often germinates after the crop reaches 12 inches tall,” says Andy Asbury, Enlist field specialist. “Atrazine, though effective, can’t be applied to corn after it reaches this height.”

Asbury notes growers can apply Enlist herbicides later in the growing season, up to the V8 growth stage or 30 inches, allowing control of more germinated morningglories.

“Morningglory in soybeans are often hidden by the crop canopy,” Asbury says. “The Enlist weed control system allows application of Enlist herbicides in soybeans through the R2 growth stage. The 2,4-D choline in both Enlist Duo and Enlist One herbicides is very effective in controlling vines such as morningglory.” 

Corteva Agriscience, Agriculture Division of DowDuPont, weed control solutions:

Corn

Resicore® herbicide
SureStart® II herbicide
Keystone® NXT herbicide
Keystone® LA NXT herbicide 

FulTime® NXT herbicide
Surpass® NXT herbicide 
Durango® DMA® herbicide
Enlist Duo® herbicide, as part of the Enlist weed control system
Enlist One™ herbicide, as part of the Enlist weed control system

Soybean
Sonic® herbicide
Surveil® herbicide
Durango® DMA® herbicide
Enlist Duo® herbicide, as part of the Enlist weed control system
Enlist One™ herbicide, as part of the Enlist weed control system


Additional information:

Identifying weeds in field crops, Michigan State University
Morningglory fact sheet, University of Missouri

Sources:
1United Soybean Board. 2016. Morningglory Management in Soybeans.
https://iwilltakeaction.com/uploads/files/54403-01-factsheet-morningglory-lr_1.pdf
2Hurst, H. R. 1991. Ivyleaf Morninglory Control in Soybeans with Serial Herbicide Applications.
http://mafes.msstate.edu/publications/bulletins/b0978.pdf

®™Trademark of The Dow Chemical Company (“Dow”) or E. I. du Pont de Nemours and Company (“DuPont”) or affiliated companies of Dow or DuPont. FulTime NXT, Keystone LA NXT and Keystone NXT are federally Restricted Use Pesticides. Duramax, Durango DMA, FulTime NXT, Keystone LA NXT, Keystone NXT, Resicore, Sonic, SureStart II, Surpass NXT and Surveil are not registered for sale or use in all states. FulTime NXT, Keystone LA NXT, Keystone NXT, Resicore, SureStart II and Surpass NXT are not available for sale, distribution or use in Nassau and Suffolk counties in the state of New York. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Enlist Duo and Enlist One herbicides are not registered for sale or use in all states or counties. Contact your state pesticide agency to determine if a product is registered for sale or use in your area. Enlist Duo and Enlist One herbicides are the only 2,4-D products authorized for use in Enlist crops. Always read and follow label directions. ©2018 Dow AgroSciences LLC