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Weeds Waking Up: Morning Glory

April 3, 2019

While weed emergence is dependent on air temperature, soil moisture and crop residue (among other environmental factors), weeds typically germinate in the same order each year. This is the focus of our series. Morningglory is one of the later weeds to emerge, often at the end of the corn planting window and can germinate over a period of 8 to 10 weeks.

Morningglory is a difficult-to-control weed and presents several serious issues:

  • Like other tough weeds, morningglory is a yield robber.
  • Early-season competition from morningglory and other weeds fundamentally alters the way corn grows – an irreversible change that negatively impacts yield from the start.
  • Its seeds can remain viable in the soil for up to 50 years, meaning plants that go to seed leave a lasting, and costly, legacy.
  • Each morningglory plant can produce 5,000 to 15,000 seeds.
  • Left uncontrolled, morningglory crawls up and over corn plants that can slow combines at harvest.

Avoid having a tangled mess in your fields, now and in the future, by being proactive about weed management. To start clean and stay clean in 2019, we recommend Acuron®  or Acuron Flexi corn herbicides. Acuron has 4 active ingredients and 3 effective sites of action (Groups 5, 15 and 27), and Acuron Flexi, its atrazine-free counterpart, has 3 active ingredients and 2 effective sites 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 control than competitive products – especially on large-seeded broadleaf weeds like morningglory and giant ragweed. For optimal control, these brands should be applied in a 2-pass system. In a 2-pass system, a pre-emergence foundation rate of Acuron or Acuron Flexi can also be followed by a post-emergence application of Halex® GT herbicide plus either an atrazine or dicamba product. Applying Halex GT post-emergence adds an additional site of action (Groups 9, 15 and 27).

In soybeans, we recommend BroadAxe® XC herbicide (Groups 14 and 15) followed by a post emergence application of Flexstar® GT 3.5 herbicide (Groups 9 and 14). BroadAxe XC combines multiple effective sites of action for broad-spectrum activity against to manages weeds that most other herbicides miss.

If you would like input in developing a herbicide program for 2019 based on the specific weed pressures in your field, contact your Syngenta retailer, local Syngenta sales rep or visit www.ResistanceFighter.com.

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