Black Grass Weed (IMAGE) Rothamsted Research Caption Cereal offender: black grass suffocates crops and is becoming resistant to herbicides, such as glyphosate. Credit Rothamsted Research 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.