News, Events, Articles


Search for: 
Order:  Category:
Mode: 
normal boolean Display: records per page.


Bacterial diseases of herbaceous perennials - New report

News image

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. Download the report


Biological control of onion neck rot

News image

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. Download the handout


Bacterial canker of plum and cherry - new report

News image

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. Full story... Link to the full report


Disinfection of pruning tools

News image

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. Link to the HDC News


Elsoms Onion Conference

News image

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

News image

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. Link to the grower summary


HDC News: Start dry, stay healthy

News image

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. Link to the news article


New factsheet on bacterial shot-hole of cherry laurel

News image

01 Oct 2011

Bacterial shot-hole of cherry laurel (Prunus laurocerasus) is caused by Pseudomonas syringae pv syringae. The disease can lead to product downgrading and losses in cherry laurel and other susceptible ornamental plant species. A new factsheet written by Steve Roberts of Plant Health Solutions is now available from the HDC. The factsheet describes the symptoms and biology of the diseases and summarises options for disease management. Link to the factsheet


Bacterial diseases widespread in herbaceous perennials

News image

01 Oct 2011

In a survey of on herbaceous nurseries by Plant Health Solutions, bacterial diseases at all of the nurseries surveyed. The most prevalent was a geranium leaf spot or blight caused by Xanthomonas hortorum pv. pelargonii. Bacterial diseases were also confirmed on aquilegia, delphinium, erysimum and lavender. We also isolated bacteria that could be pathogenic on acanthus, primula, salvia and tiarella, but their ability to cause disease has yet to be confirmed. Results are summarised in an article in HDC News, September 2011. Link to the news article