In addition to soybean and corn seedlings, keep an eye out for one of the toughest weeds out there: waterhemp. While late-emerging waterhemp doesn’t pose as big of an immediate threat to yield as it does earlier in the season, it can deposit up to 1 million seeds in the soil bank, contributing to future problems.
- Absence of hair
- Glossy and elongated leaves
- Stem color varies from light green to dark red
After applying a pre-emergence herbicide, the next step is to apply a timely post-emergence herbicide with residual components to manage waterhemp before it reaches 4 inches. The University of Illinois reminds growers to use multiple effective modes of action on target weeds in a post-emergence application. Using the recommended rate of a post-emergence herbicide like Acuron®, Acuron® Flexi or Halex® GT herbicides in corn, and Flexstar® GT 3.5 herbicide in soybeans is an effective approach in managing waterhemp.
Because waterhemp has developed resistance to many different herbicide classes, scout your fields throughout the season to determine the effectiveness of your herbicide applications. Also, consider complementing your herbicide program with mechanical control methods and/or hand removal to avoid waterhemp escapes from going to seed.
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