Controlling aquatic weeds in dams with a pond cleaner and good water management

Anyone with a dam on their property will know that good water management is essential to keeping their dam free from an overgrowth of aquatic weeds. With the summer already here, the combination of high temperatures and falling dam levels can lead to problems with aquatic weeds choking dams and preventing wildlife and farm animals from reaching clear, fresh water.

It needs to be said that these aquatic weeds provide food and shelter for small crustaceans and fish, as well as for many birds. So the aim of water treatment is to manage these aquatic weeds, rather than to eradicate them completely from dams. The main two water management options for the control of aquatic weeds is either a mechanical pond cleaner or a chemical pond cleaner.

Using a mechanical pond cleaner for water management

A mechanical pond cleaner is best for small dams, mainly because it is very labour intensive. It simply involves cutting, dredging or chaining the water to mechanically remove the overgrowth of aquatic weeds. This type of water treatment is also expensive and doesn’t last very long, as the weeds quickly recover and grow again.

Using a chemical pond cleaner for water management

This is the method most often used by farmers to reduce the number of aquatic weeds in their dams. For these chemicals to be an effective form of water treatment, the aquatic weeds need to be identified as either emergent, free floating or submerged.

Emergent aquatic weeds have their roots embedded in the bottom of the dam with their leaves extending into the air. The most suitable chemical pond cleaner for emergent weeds is one based on glyphosate, and most of these products are frog friendly (you will need to check this).

Free floating aquatic weeds are not rooted to the bottom of the dam and the choice of water treatment depends on the species with glyphosate one of the options.

Submerged aquatic weeds are the most difficult to contain, because the chemical pond cleaner needs to reach very high concentrations in the water. The volume of water needs to be calculated and the chemical selected based on the species.

For more information on controlling aquatic weeds and good water management on your property, call 07 3889 8250 or send us an email.