<i>Palmer amaranth</i> in Soybeans (IMAGE) University of Tennessee Institute of Agriculture Caption New research shows that PPO herbicides applied to glyphosate-resistant weeds like Palmer amaranth, exhibit better control when applied at midday compared to early morning or early evening applications. Determining the optimal time of day to apply herbicides has long-term implications for weed management. Credit Larry Steckel, courtesy UTIA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.