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None in recreational ponds. In lakes, when at non nuisance
levels, filamentous algae provide cover for small animals such as
aquatic insects, snails, and scuds, which are valuable fish
Excessive growth of algae ruins
swimming in many ponds every year. No one enjoys swimming in a pond
in which long filaments of algae cling to everything they touch.
Additionally, anglers become frustrated with having to remove algae
from their lures after every cast. Algae blooms have been a
major factor in fish kills as dissolved oxygen levels are
Commonly referred to as "moss" or just plain "pond scum" this
group of algae includes Spirogyra, Cladophora, and many other
varieties. Individual filaments are a series of cells joined end to
end that give a thread-like appearance. Algae often forms surface
mats. Growth begins at the bottom and rises to the surface as
oxygen becomes trapped by the filaments. Often times this type of
algae will "disappear" after several days or immediately after rain
events when trapped oxygen is allowed to escape. This
"disappearance" lasts for only a short time until oxygen once again
High levels of nutrients can cause algae abundance to explode,
especially in ponds lacking other aquatic plants, becoming so
abundant that severe oxygen problems can result in the pre-dawn
hours during July and August.
Forms greenish mats on the water surface; begins growth along
the water's edges or bottom and rises to the surface as a
bubble-filled mass when mature; slimy or cotton-like in appearance;
may form hair-like growth on logs, rocks, and other vegetation at
lake bottom and on the shoreline.
Spirogyra gives water a "grassy" taste and odor. The texture of
filamentous algae may be slimy, cottony or coarse. Forms may
include thread like hairs, fury looking blobs or thick mats
covering the entire pond. Algae can easily attach to rocks, dock
legs and boat hulls.
A. Treat when early signs of algae appear if possible. You can
generally use lower label dose rates when algae mass is less.
A. You can easily apply liquid algaecides and herbicides with a
handheld pump-up or backpack sprayer. Apply as evenly as possible
over the treatment area. Contact as much surface algae mats as
Subsurface algae will be controlled as product (s) moves
throughout the water column. Granular products can also be applied
by hand scoop or hand spreader.
A. Several total or spot treatments may be required to maintain
control for the season. Good results should be anticipated.
A. Some algae types will succumb within a few days others may
take up to twelve days. Heavy growth may require a follow up (about
a week later) treatment. Treating before dense matting occurs will
be more cost effective yielding longer terms results.
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