Prolonged wet weather, heavy rains, flooded fields and cool temperatures have caused some very poor stands in recently planted corn. Many growers are pondering on whether or not to replant. Replant involves removing the existing poor stand either by tillage or herbicide. For those growers wanting to keep an existing pre-emergent herbicide barrier in place and not use tillage, below are the best herbicide options recommended for removing poor stands of Roundup Ready and/or Liberty Link corn. See sources below for additional information and please consult with the herbicide labels for correct application rates and adjuvants.
1. Select Max -OR- Intensity One (6 oz/a) + 0.25% NIS + AMS
- Replant no sooner than 6 days after application
- Best control with corn no bigger than V2 stage
- Avoid in-field boom overlaps or excessive crop injury may occur
- Apply in a minimum of 10 gallons of water per acre
2. Gramoxone Inteon (2.5 pt/ac for 1-3” tall corn or 3 pt/ac for 4-6” tall corn) + Metribuzin DF (3 oz/ac) + COC (1% v/v)
- Corn may be planted at any time following application
- Apply in minimum of 10-15 gallons of water per acre
- Good control on larger corn up to 6-8 inches. Use higher end of rate for taller corn.
3. Gramoxone SL [2.0] (2.5 to 3.5 pt/A) + Linex 4L (0.67 to 1 pt/A) –OR– Atrazine 4L (0.5 to 1 qt/A) + Non-Ionic Surfactant (0.25% to 0.5% v/v)
- Corn may be planted at any time following application
- Good control on larger corn up to 6-8 inches. Use higher end of rate for taller corn.
- Apply in minimum of 10-15 gallons of water per acre
Always read and follow the herbicide label when making any of these applications.
Sources:
https://graincrops.blogspot.com/2016/05/corn-replanting-removing-poor-stand.html
https://www.mississippi-crops.com/2019/04/22/new-methods-to-assess-corn-stands-and-make-replant-decisions/
https://ipm.missouri.edu/IPCM/2014/4/Herbicide-Options-for-Killing-Failed-Corn-Stands/
www.aganytime.com/Documents/ArticlePDFs/CornReplantingDecisions.pdf