30 December 2023, US: Morning Glory, also known as Ipomoea spp., is a pervasive weed that jeopardizes soybean cultivation. It vies with soybean plants for vital resources like nutrients, light, and space, thereby diminishing the crop’s yield and quality. The weed’s robust growth, swift reproduction rate, and resistance to numerous herbicides render it a formidable foe for soybean farmers.
This post will outline:
- Why Morning Glory is problematic
- How to identify Morning Glory
- Regions typically affected by Morning Glory
- Timing of Morning Glory
- How to chemically manage Morning Glory
Why Is Morning Glory Problematic in Soybean Fields?
A climbing or trailing perennial vine, Morning Glory can reach up to 10 feet in height. Its leaves take on a heart shape, while its trumpet-shaped flowers usually appear in purple, pink, or white. The seeds, dark brown to black in color, are encased in a round or oval capsule.
The rapid growth of Morning Glory and the emergence of its distinctive flowers often signal its presence. The plant’s vines can swiftly overrun a soybean field, entwining around the soybean plants and impeding their growth, sometimes even causing them to bend and snap. This can drastically stunt the growth of the soybean plant and reduce its yield. The leaves of Morning Glory can also overshadow the soybean plants, blocking sunlight and inhibiting photosynthesis.
By competing for essential resources, Morning Glory can induce nutrient deficiencies in soybean plants. This can result in reduced growth and development, yielding smaller, less productive plants. Moreover, the stress induced by this competition can render soybean plants more vulnerable to diseases and pests.
Geographic Distribution of Morning Glory
Morning Glory, which thrives in diverse climates and soils, is commonly found across the United States, particularly in southern and midwestern states where soybean is a major crop.
Timing of Morning Glory
Morning Glory usually sprouts in late spring and early summer, reaching peak flowering in late summer and early fall. However, its seeds can endure in the soil for several years, enabling it to reemerge season after season.
How to Manage Morning Glory in Soybeans
- Alligare 2,4-D Amine
- BashAzon Herbicide
BashAzon Herbicide contains Bentazon and is specifically designed for use with soybeans to control Morning Glory. Alternatively, Alligare 2,4-D Amine contains 2,4-D, dimethylamine salt and is also labeled for use with soybeans to manage Morning Glory.
The recommended application rates for these products are:
BashAzon Herbicide: The typical application rate for peas is 1 US liquid pint per acre, with a range of 1-2 US liquid pints per acre. More information about the product, including the suggested rate ranges, can be found on the BashAzon Herbicide product page.
Alligare 2,4-D Amine: The typical application rate for soybeans is 24 ounces per acre, with a range of 16-32 ounces per acre. This information, along with the suggested rate ranges for other crops, can be found on the Alligare 2,4-D Amine product page.
These rates are general guidelines, and it’s always important to read and follow the specific instructions provided on the product labels for accurate application rates and guidelines.
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