John Adlam, independent horticultural consultant with Dove Associates, said: "Moss and liverwort are extremely prolific weeds in ornamental plants. They like the organic growing medium used in the sector and, subsequently the weed is able to spread quickly and easily.
"Consequently, this can be a very costly weed, with as much as 25 per cent of the cost of preparing the plant for sale spent on removing liverwort from plant pots. A very labour intensive and time consuming operation that up to now growers have not been able to avoid."
When Mogeton, which contains quinoclamine, was registered solely for amenity use, the ornamental industry lost the previous use for it as a moss killer and since then there have been no other effective means of controlling moss in this sector.
"As a result, there was a desperate need for the availability of a moss control product that could target this costly weed.
"Although it has taken three applications to CRD to allow for Mogeton to be used in this way, our latest application addressed all the areas that CRD had highlighted as causes for concern, and we’ve now been successful."
The new EAMU states that for use of Mogeton on protected ornamental plants, the maximum individual dose is 15kg/ha, with a maximum of one treatment per crop per year.
Adlam said: "Even with some restrictions on the application of the herbicide on this new EAMU, it has been extremely important to be able to get Mogeton available again for growers.
"At a time when margins are tight, a product that will help reduce the cost of production and control a potentially economically devastating weed, will have a significant benefit for growers in this sector"
The Horticultural Trades Association have supported the application through their technical committee by showing CRD the nature and extent of the problem out on nurseries.
This extension of the authorised use provides for the use of Mogeton in respect of crops and situations, other than those included on the product label. No efficacy or phytotoxicity data have been assessed and as such the ‘extension of use’, is at all times done at the user’s choosing, and the commercial risk is entirely theirs. Users must be in possession of a copy of the Extension of Authorisation Number: 2273 of 2015 for full details of product extension prior to use.
The product approval can be downloaded from the Health and Safety Executive website in the Pesticide register of Approved Products https://secure.pesticides.gov.uk/pestreg/
The EAMU can be downloaded from the Extension of Authorisation for minor use database https://secure.pesticides.gov.uk/offlabels/search.asp