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Gain Control of Morningglory

December 1, 2017
This agronomic image shows morningglory.


From robbing corn and soybean yields to remaining viable in soil for more than 50 years, morningglory is one of the toughest weeds to control. As with other large-seeded broadleaves, morningglory seeds are relatively large and when the plant emerges, it is often bigger than small-seeded broadleaf weeds.

If left to compete all season, just 1 morningglory plant per foot of row can reduce soybean yields by 50%. Although there aren’t confirmed cases of herbicide resistance in morningglory, it is still difficult to control due to its large seed size and seed coat, its ability to germinate late in the season and its tolerance of glyphosate.

Facts about Morningglory:

  • It favors warmer climates and is typically found in the South and central U.S.
  • It germinates in early summer and favors day temperatures around 85 degrees Fahrenheit
  • It can produce anywhere from 5,000 seeds per plant to more than 15,000
  • Its leaves are heart-shaped or lobed and range from 2 to 5” in length and 1.5 to 4” wide
  • They are a vining plants and have tendrils for climbing
  • The flowers are funnel-shaped and typically blue, purple or white

Syngenta offers best-in-class herbicides that provide effective multiple modes of action to control morningglory in both corn and soybeans. Acuron® corn herbicide has 4 active ingredients and 3 effective modes of action (Groups 5, 15, and 27). Its atrazine-free counterpart, Acuron Flexi corn herbicide, has 3 active ingredients and 2 effective modes of action (Groups 15 and 27). Both contain the active ingredient bicyclopyrone, which complements the other active ingredients to deliver more effective and more consistent waterhemp control than competitive products. For optimal control, these brands should be applied before morningglory emerges. Acuron and Acuron Flexi can be applied alone or pre-emergence followed by a post-emergence application of Halex® GT corn herbicide (Groups 9, 15 and 27).

For soybeans, Syngenta recommends a pre-emergence herbicide application of BroadAxe® XC herbicide (Groups 14 and 15) for early-season weed management and long-lasting residual control. For post-emergence control, Flexstar® GT 3.5 delivers 2 different modes of action (Groups 9 and 14).

Visit ResistanceFighter.com to learn more about weed resistance management in corn, soybeans and wheat.

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