Your first line of defence against weeds should be cultural controls; no herbicide programmed will work effectively without good nursery hygiene. Any established weeds around the crop that are allowed to set seed will create huge pressure that can reduce the effectiveness of herbicides. Non-crop areas and paths should be kept clean and free of weeds that could run to seed.
Past work has shown that a little-and-often approach with a weekly hand weeding routine is more effective and requires fewer labour inputs overall compared with a periodic purge; the ultimate aim should be to avoid any weed setting seed. In production areas plug and liners should be kept clean, and remove all weeds prior to potting. Woven plastic bed covers (e.g. MyPex) should be maintained and replaced when required. Beds should be well draining to help kept them clear of liverwort and moss, helping to prevent further weed establishment.
Gravel or sand beds can be sprayed with residual herbicides like Chikara prior to standing crops down on beds. Chikara can give up to five months residual weed control, as a rule of thumb most residual herbicides persist for up to twelve weeks. Plan your irrigation schedule to maintain a dry regimen and avoid excess irrigation to reduce leaching of residual herbicides and reduce the weed pressure for species like willows (Salix) that require damp surfaces to germinate.
Keep old and new stock separate as older stock generally has a heavier weed burden which can easily spread. You may also wish to consider how long you wish to retain old stock as the costs of cleaning up older stock can outweigh the costs of disposal and starting from scratch.
The full technical advice sheet can be downloaded below.
Tyfu Cymru's Integrated Pest and Disease Management Network provides training on the recognition of pest, diseases and beneficial insects and will help growers to determine current pest and disease pressures and the need for their prevention and cont…10/22/2021 2:35:16 PM
In the 4th session the Ornamental group lead by David Talbot we looked at limiting the impact of common Summer Pathogens and Vine Weevil.6/18/2021 2:07:03 PM
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Plant Biosecurity in the Welsh Ornamental Plant Trade - An Overview from Dr David Skydmore. This webinar is one in a series of workshops and webinars comprising Tyfu Cymru’s Plant Health Programme.8/18/2020 10:37:20 AM
Webinar with David Talbot from ADAS on Integrated Pest Management for commercial ornamental growers in Wales.6/29/2020 1:56:21 PM
Charles Dowding joins us for a Q&A session with Welsh commercial growers following his walk through of No Dig Methods and Intensive Cropping in part one of the webinar series.6/12/2020 5:04:55 PM
In the first part of this webinar Charles presents the benefits of no dig and intensive cropping with an online walk through of no dig growing covering all aspects from no dig polytunnels to planting, composting, multisowing and propagation.6/12/2020 4:59:52 PM
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