Both summer and fall are important times for ranchers to keep an eye on cattle that graze where Johnsongrass is present, due to the risk of prussic acid toxicity.
Clark Roberts, manager of Noble Research Institute’s Coffey Ranch at Marietta, Oklahoma, says that drought conditions put him on high alert for two reasons.
“Anything that physically stresses Johnsongrass, such as drought in summer or freezing in the fall, can increase the amount of prussic acid in…
