Control - Chemical
The use of chemicals such as Clarosan in still water for submerged weeds is ideal but it is still a difficult operation. No more than 30% of the surface area of water can be treated in one application. Clarosan is classed as a self dispersant and if you are not treating the whole water body or may still have weed left in the areas where the Clarosan was originally placed.
All inlets and outlets must be closed for at least 10 days. A still water is defined as a water body which is moving less than 5 metres per hour. This can be applied by hand or broadcaster. Glyphosate can be used to spray emerged plants such as bull rushes and lilies. This would be applied with a knapsack, quad bike with booms, hand lance or boat mounted sprayer.
If the water is moving between 5 and 90 metres per hour and has no floating sediment present then a viscous gel formation is specially designed for flowing water, but can be used in still waters. On contact it gives rapid control of submerged weeds and certain floating weeds. Only weeds in the immediate vicinity of the treated area are affected, so making par treatment of the waterway possible.
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