Livestock can be exposed to HABs, and their associated toxins, through either direct contact or drinking water sources that are contaminated with HABs. This can include a pond itself, or a water trough that is fed by a pond.

The Clemson University Plant Diagnostic Clinic can identify species of algae present and offer control recommendations. A sample can be submitted to the lab through your local county Clemson Extension Office by following these algae sample submittal instructions. The clinic does not test for the presence of toxins in samples. If concerned, work with a commercial laboratory for assistance. At-home, commercial test kits offer assistance with rapid detection of some types of algae or toxins, though may not be comprehensive enough to detect all potential HABs or toxins.

Try to limit livestock access to the pond and find alternate sources of water. If your livestock have been exposed, contact your Large Animal Veterinarian as soon as possible.

Clemson Extension can provide prevention and control recommendations to pond owners on aquatic plant and algae issues. The article, Pond Weeds: Causes, Prevention, and Treatment Options, provides an overview of management and prevention options.

Pond management companies can assist with algae control and management. Follow all pesticide label recommendations for waiting periods following application if the pond is a drinking water source for livestock.

Nutrient reduction, waste management, and other agricultural best management practices will be important for future prevention of HABs in ponds. Contact the Natural Resource Conservation Service or Clemson Extension for best practice recommendations on your farm.

Currently, there is no regulation on HAB-related toxin concentration in irrigation water or crops. Recommended limits for HAB-related toxins in drinking water can be found on the “For Drinking Water Utilities” section of this website. However, if an irrigation water source is impacted by a harmful algal bloom, like cyanobacteria, there is the potential that HAB-related toxins could accumulate in irrigated fruits and vegetables. Accumulation is dependent on many different factors including type of crop, method of application, and other factors.

For issues, growers can work with pond management companies to assist with algae control and management. Follow all pesticide label recommendations for waiting periods following algaecide or herbicide application if the pond is an irrigation source. Alternate sources of irrigation water can reduce impacts of HABs on irrigated crops.