Blue-Green Algae

Blue-Green algae (Various genera) forms a skim on the surface of a pond that can be light green, dark green, blue or even white.  It is common to have blue-green algae blooms in mid-summer even on larger lakes and reservoirs.  They are usually found in fertile ponds that may have excessive nutrient inputs.  They are often accompanied by a foul sulfurous odor and in extreme conditions can create toxins that will lead to fish kills.  Some people can have adverse reactions (itching, hives) to contact with blue-green algae blooms and many reservoirs post warnings during large bloom events.

Management Options

Mechanical Options

There are no practical mechanical options for controlling blue-green algae due to their small size and unicellular nature.

Biological Options

Biological options are not available due to the toxins produced by the algae and the lack of species that consume them.

Chemical Options

The active ingredients that have been successful in treating blue-green algae include: copper based compounds (E), sodium carbonate peroxyhydrate (G), alkylamine salts of endothall (G), and flumioxazin (G). E = excellent, G = good

Information on Chemical Treatment of Aquatic Vegetation

Return to Planktonic Algae page