Aquatic Weed Control
Killing weeds in water
Since the loss of approval of dichlobenil, aquatic weed control has become a major challenge. Glyphosate products approved for aquatic situations (such as Roundup ProActive, Glyfos Gold and Kernel) will only work on pond weeds if the water level can be lowered to expose them - not often a very practical method.
However, if aquatic weeds are in a very dense matt and there is emerged leaf, or indeed the water level could be reduced to expose more of the plant, then it is possible that Roundup ProActive would have some effect.
About aquatic weed control
Aquatic use means spraying in, on or near water, which can be open or closed (i.e. river or pond).
Using herbicides in aquatic applications
All aquatic use herbicides require Environment Agency approval; contact your local EA office before work begins. The Department of Environment, Food and Rural Affairs (DEFRA) enforces strict rules on the use of herbicides in aquatic areas. Please see The Environment Agency literature: SC120008 - Aquatic and Riparian Plant Management.
Controlling aquatic weeds / pond weed control
Roundup ProActive is a professional strength glyphosate which provide long term aquatic weed control. It controls both emergent and floating weeds.
Emergent weeds – bulrush, common reed, creeping bent, reed canary grass, reed sweet grass, sedges, soft rush, watercress and whorlgrass
Floating weeds – white water lily, yellow water lily.
When Roundup ProActive is used as directed there is little risk to spray operators, wildlife or the environment. It may be used in waters stocked with fish (if used in accordance with the recommendations shown on the product label). Use a knapsack sprayer or weedwiper to apply.
Adjuvants for aquatic weed control
Floating or emergent pond weeds will require an adjuvant with glyphosate to help it ‘stick’. TopFilm, (a natural biosponge called Biocar made from maize) may improve control of species where herbicide wash-off is a problem, e.g.: parrots feather (myriophyllum aqauticum), fringed water-lily (potamogeton natans), floating pennywort (hydrocotyle ranunculoides), water primroses, canadian waterweed (elodea canadensis), Australian swamp stonecrop, fringed water lily (nymphoides peltata).
TopFilm is an approved adjuvant for use in water.