Poisonous Plant Alert Regarding Cattle

Editors note: Perilla Mint is not very common in our area and usually comes into play when pastures are highly stressed. The recent rains should be a help. Reported by Agri-Life Extension Agents Several head of cattle in Jasper county have reportedly died from eating the plant Perilla Mint (Perilla frutescens).This toxic plant contains "perilla ketone", which produces pulmonary edema and pleural effusion. Toxic cases are usually in the late summer or fall after grazing the plant. The plant grows in shady areas under trees where cow rest and get some relief from high temperatures.

Symptoms: Affected animal exhibit respiratory distress. They have difficulty breathing especially when exhaling. They may grunt when exhaling and may have a nasal discharge and elevated temperature. Postmortem examination reveals pulmonary emphysema and edema. The perilla mint seeds are often found in the rumen of the cow. Treatment: Once symptoms of the severe pulmonary edema and emphysema occur, treatment us usually ineffective. Contact your veterinarian for more medical advice.

The best time to control Perilla mint is late April to early June. It is very difficult to control in late summer and early fall when it also becomes the most dangerous to livestock. It is very crucial especially in late summer to maintain an adequate supply of quality feed for cattle and other farm animals. Grazing in infested pastures should be limited during later summer when perilla mint is flowering. Avoid harvesting forages in areas infested with these weeds. Mowing plants before seed is produced will help prevent further reproduction and spread. Early use of herbicide such as GrazonNext, Grazon P+D, 2,4-D or Remedy while actively growing (young) is best.