Technical
When considering treating weeds along streams and ditches, consider the overall effect of removing the targeted weeds and ensure bank stability and erosion would not result from total weed control. Spot treatment is preferable, unless the weeds have taken over the whole area.
Where a large proportion of the
watercourse is congested with weeds in the presence of fish, de- oxygenation caused by decaying weed vegetation can be avoided by phased treatment over a period of several weeks.
Minimise drift by choosing low
drift nozzles and treating only when wind conditions are within safe spraying limits. Spray when rain is not expected
for at least four hours. When used according to the label, there is no adverse effect on other wildlife as glyphosate is not metabolised by fish, birds, insects, amphibians or reptiles. Glyphosate is degraded by the microbes naturally present in the water and sediment.
Relevant legislation
In common with other forms of weed control, land managers must abide by relevant legislation. For glyphosate, that means the Plant Protection Products (Sustainable Use Regulations 2012), whilst specifically for some algaecides this means the Biocidal Products
Regulations and the Control of Pesticides Act. The Habitats Directive prevents
spraying of emergent vegetation when birds are nesting. Care must always be taken to prevent any drift on to non-target vegetation, and the use of coarse droplets is recommended to assist in achieving this.
All aquatic use of herbicides
requires Environment Agency Approval, even where the water body is privately owned or does not drain into a watercourse. Form AqHerb01 should be requested from the local EA office, filled in and work should not begin until consent is given. Anyone spraying in aquatic areas should be qualified with PA6A (021654, module152). Remember that Grandfather
rights have recently been revoked, so anyone born before 31st December 1964 will need to be fully qualified if they are applying herbicides to someone else’s land or water, in the same way as younger operators. BASIS qualifications in Aquatic Herbicides are required by anyone giving advice on aquatic herbicide usage.
Pesticide Application and Pond Maintenance training courses are available from
www.groundstraining.com
Emergent riparian weeds, such as reeds and rushes, can encroach into the lake or across a line of sight
Rates of use for Roundup (sprayer with standard 200l/ha nozzles) Floating weeds
Roundup ProActive Roundup ProVantage
In 100-200l water/ha 6l/ha 30ml/litre
4.5l/ha 22.5ml/litre
Emergent weeds
In 200-400l water/ha 5l/ha 25ml/litre
3.75l/ha 19ml/litre
Avoid high volumes which may lead to run off. Use telescopic lances to extend the length of the lance from the bank up to 5m
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