Pre-Plant Herbicides for Corn and Soybean Success

By Blake Jackson

Spring planting can often require quick decisions regarding whether to plant corn or soybeans. To accommodate this, farmers need flexible herbicide programs that allow for switching crops.

Several herbicides can be applied before planting or pre-emergence in both corn and soybeans, providing this flexibility. However, it's crucial to adhere to specific application rates and waiting periods, which may vary between crops.

For burndown applications, 2,4-D LVE is suitable, with a 7-day waiting period for soybeans at 1 pint/acre and 15 days at 1 quart/acre. Basis Blend can be used, but lower rates are advised to minimize potential corn injury, especially in cool, wet conditions.

Elevore offers control of glyphosate-resistant marestail, with a 14-day waiting period for both crops, though corn can be planted earlier under certain conditions.

Glyphosate and Gramoxone 3.0 SL/paraquat are also versatile, with Gramoxone benefiting from tank mixing with metribuzin and 2,4-D.

Harmony/Extra and similar mixes can be added to burndown applications for broadleaf control but require 7 days before planting soybeans and 14 days for corn.

Liberty 280 and Reviton are effective on small weeds, with Reviton offering immediate corn planting but requiring a 7-day wait for soybeans at higher rates. Sharpen can be used, but caution is needed with soybean planting restrictions and adjuvant use.

For residual grass control, Group 15 products like s-metolachlor/Dual, acetochlor/Enversa, and Outlook are suitable for both crops.

Lorox, metribuzin, and Python offer broadleaf residual control, while Valor can be used with specific planting restrictions and tank-mixing considerations.

Products like Verdict, Zidua, Anthem Maxx/Flex, and Fierce provide both grass and broadleaf residual control. Combinations of grass products with Python also offer dual control.

Farmers should consult product labels for detailed instructions and consider generic alternatives. Always be aware of potential crop injury and adhere to recommended application rates and waiting periods to ensure successful planting and weed management.

Photo Credit: gettyimages-frankoppermann