Winnipeg Free Press: Retention ponds loaded with algae

When used correctly, diquat does not impact human health, said Mark Hanson, a University of Manitoba professor and the Environment and Geography department head.

“If applied properly, diquat does not pose any undue risk to wildlife or aquatic organisms,” he said.

Herbicides can be safe, effective and economical in controlling nuisance plants, Hanson said, adding mechanical and physical removal are alternative methods of removing aquatic plants.

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