Science Into Practice - New herbicides for raspberries

A number of traditional residual herbicide products have been lost to the raspberry industry over the past decade.

HDC-funded project SF 119, managed by John Atwood of ADAS, targeted potential replacements.

The best-performing products from the first year of the project (Chikara and Artist) were reassessed in the final year along with some newer products including Wing-P and Gamit 36, either in combination with each other or with the standard treatments Stomp Aqua and Flexidor 125.

Over the whole trial, Chikara stood out as the most effective product. Used in a mix with Stomp Aqua to improve control of black nightshade and common field-speedwell, weed control was comprehensive and more persistent than the other treatments.

Artist mixed with Stomp Aqua performed better than the industry standard Flexidor 125 + Stomp Aqua in the 2011-12 trial and as a single treatment did well in the 2010 long cane trial. It gave good initial control of groundsel in the 2010 established crop trial but control deteriorated after eight weeks.

Wing-P was also relatively effective as a single treatment in the 2010 trials but control had deteriorated by 12 weeks after treatment. The mix of Wing-P with Gamit 36 CS was more effective in 2011 than in the wetter conditions of 2012.

At present, Chikara, Wing-P, Gamit 36 CS and Artist do not have approval for use on raspberries, but HDC is in the process of applying for EAMUs or in discussion with manufacturers about the future use of other products on raspberries.

Horticultural Development Company

For details on all HDC activity, visit www.hdc.org.uk


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