How to Treat Morning Glories With Preharvest Corn

Glyphosate-Sensitive Varieties

• 1

  Apply herbicides with atrazine before the corn is 12 inches tall and the morning glory is 1.5 inches tall. This herbicide needs only one application for control.

• 2

  Mix 1.5 qt. of atrazine per acre of area. Follow the directions on the amount of water to add to the tank.

• 3

  Spray on a windless day, when the plants are dry and free of dew. Use the nozzle on the tightest stream setting. Apply the product directly to the weed or drench the soil around it. The method you use will depend on how densely the stand of corn has been planted.

Glyphosate-Tolerant Varieties

• 4

  Spray a foliar mix of glyphosate and water onto the newer strains of corn that can tolerate the chemical. Treat when morning glory runners are shorter than 6 inches.

• 5

  Mix 32 oz. per acre of glyphosate into the tank with the required amount of water. Apply the product when the corn is under 12 inches tall. Glyphosate will provide residual control for future morning glory sprouts.

• 6

  Apply the spray directly to the leaves of the morning glory. It will be absorbed into the plant from the leaf stoma, and travel down to the root system to kill the plant. Complete kill time may be one to two weeks.