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Morningglory is a notoriously difficult weed to control, because it has a naturally-occurring tolerance to glyphosate.

  • Common name: Pitted morningglory, tall morningglory, ivyleaf morningglory
  • Scientific name: Ipomoea lacunosa, Ipomoea purpurea, Ipomoea hederacea 
  • Cotyledons: Two, notched leaves 
  • Leaf shape: Heart-shaped 
  • Reproduction: Seed pods 
  • Flowers: Trumpet-shaped in many colors, including purple, pink, blue and white

Fast Facts

  • Morningglory is a summer annual broadleaf. 
  • and do not list morningglory as being herbicide-resistant in any state in the United States. However, the weed is shown to have a natural tolerance to glyphosate. 
    • The Mississippi Soybean Promotion Board does list morningglory as being resistant in the state on its website
    • The University of Michigan has also conducted research on morningglory’s tolerance, calling it resistance, which the university wrote about in an article you can find here
  • A single tall morningglory plant per row foot can potentially cut soybean yield in half. 
  • Depending on the species, a single morningglory plant can produce as many as 15,000 seeds. 
  • The weed is very difficult to control, because it produces large, hard seed pods with an impermeable seed coat. 
  • Morningglories can germinate late in the growing season after crops have already been established.

Control Tips

  • Control existing morningglories with a preplant burndown herbicide application. 
  • Use a program approach to weed control, with multiple modes of action, including the use of the full rate of a nonglyphostate, preemergence herbicide. 
  • Use narrow row spacing when planting crops like soybeans. This will decrease the amount of time needed for the crop canopy to develop and take sunlight away from morningglories.

Corteva Agriscience offers the following weed control solutions.
Corn herbicides:

Soybean herbicides:

1United Soybean Board. 2016. Morningglory Management in Soybeans.

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