LSU AgCenter . Aquatic Weed Control Subportal

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Aquatic Weed Control

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Aquaculture

Recreational Ponds

Aquatic Weed Control

Aquatic weeds are a common problem with recreational ponds. These articles provide information on types of aquatic weeds and mechanisms for controlling them.

Aquatic Weed Control
Aquatic weeds are a common problem in recreational ponds. This document discusses aquatic weeds and ways of controling them.

Fertilization of Fish Ponds

When ponds are fertilized, nutrients stimulate the growth of microscopic plants in the water (phytoplankton). Phytoplankton is food for other organisms (zooplankton and larger animals) that are eaten by fish. Abundant growth of these microscopic plants gives water a turbid, greenish color (called a “bloom”) that can prevent light from reaching the pond bottom and reduce the growth of rooted aquatic weeds.

Aquatic Weed Management: Control Methods

Basic methods used to control weeds include preventive, mechanical, biological and chemical techniques. Determining which of these techniques to use involves consideration of the target weed species, fish production objectives for the pond, secondary water uses and the cost of treatment options.

Weed Management in Lakes and Ponds

Lakes and ponds can develop dense stands of aquatic vegetation that interfere with intended uses and destroy the natural beauty of the water. Most aquatic weed problems result from poor planning and poor management. Manipulating factors such as water, light and nutrients can help prevent weed growth.

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Aquatic Weed Management: Herbicides

Herbicides are just one method of managing aquatic weeds. There are also: 1) preventive methods such as proper pond site selection and construction, fertilization andperiodic draw-downs; 2) biological methods such as grass carp (Ctenopharyngodon idella); and 3) mechanical methods such as cutting, seining and raking. Using a combination of methods is the most effective method of managing aquatic weeds.

Aquatic Weed Management: Herbicide Safety, Technology and Application Techniques

Aquatic herbicides are chemicals used to kill aquatic plants or severely interrupt their growth. About 200 herbicides are registered by the EPA for use in the United States, but only six are labeled for use in aquaculture sites. It is important that aquaculturists use these registered herbicides in a safe and effective manner.