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Plant Identification  --  Algae  --  Tolerant Algae
TOLERANT ALGAE

A few forms of algae may be encountered which show some tolerance to control with Cutrine-Plus and other chemicals. In these situations, the following recommendations should be attempted to obtain conditional control:
Pithophora is a dark green filamentous algae (also known as horse hair algae). It commonly grows in coarse clumps of tangled filaments resembling pads of steel wool. Individual filaments show extensive branching. Due to its high production of reproductive cells, known as akinetes, growth is quite prolific. Pithophora grows on the bottom and sporadically surfaces.
Lyngbya spp. is a blue-green algae. The species which are particularly troublesome to control are those which grow in colonies forming small spongy masses of mucilage. These blue-green, black or gray clumps made up of thousands of individual cells will lay on the bottom or float to the surface. Because of the protective mucilage, chemical control is difficult.
Colonial Diatoms - diatoms are a form of algae characterized by having cell walls made of silica, a mineral substance. Certain species of diatoms grow in colonies, usually on sand or concrete surfaces, and produce gelatinous masses. Generally, these colonies are brown to grayish in color. Effective control has been achieved using Clearigate at the rates of 1.8 to 2.7 gallons per acre-foot treating the entire water volume. Repeat applications may be needed.
Conditional Control Alternatives:
For Pithophora

When water temperatures are between 50 degrees F and 60 degrees F, apply 1.2 gallons of Cutrine-Plus with a non-ionic surfactant per acre-foot of water followed up to 7 to 10 days later with 60 pounds of Cutrine-Plus Granular per surface acre.

For Pithophora or Lyngbya

 Tank mix 1 part Reward to 1 part Cutrine-Plus, add a non-ionic surfactant, and apply at the rate of 2 gallons of mix and apply at the rate of 2 gallons of mix per acre
OR
Apply 2.5 to 4.0 gallons of Clearigate per acre-foot of water concentrating on littoral/shoreline areas (higher rates for most tolerant forms).
OR

Tank mix 4 parts Cutrine-Plus to 1 part Hydrothol® 191 and apply at the rate of 3 gallons of mix per acre-foot.



Descriptions and pictures are from the book "How to Identify and Control Water Weeds and Algae", Edited by James C. Schmidt, 5th edition revised 1998, copyright 1976 Applied Biochemists.
 
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