CDA Spraying Herbicide and Applicators

Weed spraying and control 

CDA which stands for Controlled Droplet Application is a method of low volume spraying used to apply pesticide, in the UK this method is used generally for the application of herbicide to weeds. CDA has distinct advantages over conventional spraying (spraying through a nozzle) which are based on productivity and efficiency. They are used extensively by local authorities, housing associations and other large scale users of herbicide, to control weeds which are growing on kerb edges and footpaths, shrub beds and around street furniture to create mowing margins. 

Handheld weed spraying 

A handheld CDA lance like the Riverlynx Eliminator and Eradicator are ergonomically designed to be light and easy to manage by the operator, the CDA mixed herbicide is applied at a consistent and accurate application rate through the pumped system within the lance and down onto the weeds. Because the application rate is much less than with conventional spraying  the operator can treat more area than with a knapsack sprayer for instance but is also less fatigued by the end of the day because the system is lighter and easier to use. Overall the volume of liquid applied is less and therefore fewer fill-ups are required which increases productivity. 

A CDA applicator differs from a normal conventional sprayer in that the liquid isn’t forced through a hole within a nozzle but by being delivered via a tube onto a spinning disc which then throws the droplets from it. CDA (controlled droplet application) forms a larger droplet with less small droplets – the small droplets which are common in conventional spraying are the droplets which cause the most damage to areas surrounding the area of treatment because they can drift.  


Herbicide approved chemicals 

Most herbicide in the UK is either supplied in a premixed formulation, or is supplied with a normal conventional herbicide which is then mixed with a carrier chemical such as Riverlynx Ecomark, Unimark or Countymark – these carrier chemicals increase the droplet size to the required size as designated by the product label and approved by the UK Chemicals Regulation Directorate (CRD). They also help to reduce drift and aid sticking to the plant’s leaf and the take-up of the herbicide in the plant. Using Riverlynx Ecomark, Unimark or County Mark, is more cost effective than using a premixed herbicide. By adding herbicide to a carrier chemical it also gives the end user flexibility on the herbicide they want to use, this again can give the end user a choice of using the best possible herbicide technology to kill the weeds or the most cost effective option.   

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