News, events, articles
Bacterial diseases of herbaceous perennials - New Factsheet
31 Jan 2014
A new factsheet on bacterial diseases of herbaceous perennials has recently been published by the HDC. Bacterial diseases can cause significant losses to growers of herbaceous perennials, but often go unrecognised until it is too late for effective control. The factsheet, written by Steve Roberts of Plant Health Solutions, summarises information from a recent HDC project on their identification and management. Most of the diseases in herbaceous nursery stock are caused by Pseudomonas spp. and Xanthomonas spp., these included leaf spots on acanthus, aquilegia, delphiniums, geraniums and blights on perennial wallflowers and lavender.
Onion storage rots caused by Burkholderia gladioli
20 Nov 2013
The most common cause of bacterial rots in stored onions in the UK seems to be Burkholderia gladioli pv. alliicola (formerly called Pseudomonas gladioli pv. alliicola). Problems are perceived to be worse in crops grown from sets, and in wet seasons. Testing has shown that the pathogen can be present in sets at the time of planting, and can be present in growing crops without any apparent symptoms. Our poster presented at the 2013 UK Carrot and Onion Conference is now available to download.
Bacterial diseases of herbaceous perennials - New report
11 Oct 2013
Our final report for HDC project HNS 178 on bacterial diseases of herbaceous perennials is now available on the HDC website. Highlights include recommended health standards for Xanthomonas in Erysimum cuttings / plug plants and Pseudomonas syringae pv. delphinii in Delphinium seed. After an initial survey to establish the most important bacterial diseases in the first year, the project made detail studies of two model diseases: bacterial blight of Erysimums (wallflowers) and bacterial blotch of Delphinium. Plant Health Solutions now provides testing services for Xanthomonas in Erysimum cuttings and for Pseudomonas in Delphinium seed.
Biological control of onion neck rot
18 Sep 2013
The handout of a new poster describing the latest results from a project to identify commercial biological seed treatments for onion neck rot is now available to download. The disease is caused by Botrytis aclada (allii) and has been reported to cause up to 48% losses in stored bulbs. It can be seed-borne, so seed testing and seed treatments are important for its control. We also offer a routine seed health testing service for seed companies and growers.
05 Jul 2013
Bacterial canker is probably the number one killer of plums and cherries. It is caused by two distinct pathovars of Pseudomonas syringae: pv. morsprunorum and pv. syringae. As well as stem cankers, they also cause leaf spots, shot-holes, bud death, shoot diesback and flower blights. Our latest report, covering 3 years of work on the epidemiology and control of this disease is now available on the HDC website.
Disinfection of pruning tools
12 Feb 2013
Research by Plant Health Solutions on practical methods for disinfection of pruning tools in the field is highlighted in the February edition of HDC News. The research tested a number of options for reducing the potential transfer of the plum and cherry bacterial canker pathgoen (Pseudomonas syringae pv. morsprunorum) on pruning tools. Although not perfect, regular use of iso-propanol impregnated disinfectant wipes is recommended as the best solution.
Elsoms Onion Conference
07 Nov 2012
Steve Roberts of Plant Health Solutions will be presenting some of the latest work on onion storage rots caused by the fungus Botrytis aclada/alli and the bacterium Burkholderia gladioli pv. alliicola at the Elsoms Onion Conference.
HDC Website upgrade breaks links
09 Aug 2012
Due to an "upgrade" to the HDC website, many of the links to reports and documents are now broken. We apologise for this inconvenience, but it is beyond our control. We will endeavour to correct as time permits.
Confirmed: coriander blight pathogen infects parsley
01 Jul 2012
Thanks to funding from the HDC (Horticultural Development Company), we have been able to confirm reports from the USA that Pseudomonas syringae pv. coriandricola is able to infect parsley. Tests with a number of recent isolates of the pathogen from the UK have confirmed that they are pathogenic on parsley. This potential for cross-infection could have considerable implications for epidemiology of bacterial diseases on these hosts. P.s. pv.coriandricola is seed-borne on coriander and Plant Health Solutions provides a seed testing service that can detect the pathogen.
HDC News: Start dry, stay healthy
01 Nov 2011
Keeping watering to the minimum is likely to have the biggest impact on soil-borne Pythium infection in brassica transplants. Incorporating composted green waste or the bio-pesticide Trianum G into the the growing-medium can also reduce Pythium, but their effects weren't as big as reducing the amount of watering. Several natural/biological seed treatments were also shown to reduce the seed-borne fungi Phoma and Alternaria, but these did not have any effect on the soil-borne Pythium. These results come out of a 2-year joint project between Steve Roberts of Plant Health Solutions and John Clarkson of Warwick Crop Centre, University of Warwick.