Mon, 23 May 2022

News, events, articles

New factsheet on bacterial shot-hole of cherry laurel

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

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

Coriander blight pathogen infects parsley

01 Jul 2011

A recent scientific paper from the USA suggests that the seed-borne coriander bacterial blight pathogen (Pseudomonas syringae pv. coriandricola, Psc) is able to infect not only coriander but also parsley and celery. These results contradict earlier studies indicating that P. s. pv. coriandricola is not a pathogen of parsley or celery. This potential for cross-infection, if confirmed, could have considerable implications for epidemiology of bacterial diseases on these hosts. Plant Health Solutions hopes to confirm these results for isolates from the recent HDC-funded project, if financial support can be found. Link to the paper in Phytopathology

Onion sets and storage rots

01 Jun 2011

Bacterial rots caused by Burkholderia gladioli pv. alliicola, neck rot caused by Botrytis allii and Fusarium basal rot caused by Fusarium oxysporum fsp. cepae are the main storage rots of concern to onion growers. Problems seem to be greater in crops grown from heat treated sets. So, in collaboration with the Warwick Crop Centre and funded by the HDC, Plant Health Solutions will be investigating the extent to which these diseases are associated with sets of different types and from different sources. Read more

Clean seeds for clean leaves

01 Sep 2010

Results from a joint Plant Health Solutions - ADAS project were highlighted in the September 2009 edition of HDC News. The project targeted two seed-borne disease, coriander bacterial blight and parsley septoria leaf spot, that are recurring problems in field grown herbs. Clean seed is a key part of disease management for both diseases, so the project has provided new insights into the relationships between seed infection and disease development. New seed health standards have been defined and potential seed treatments identified. Read more Details of PHS seed testing services

New Bacterial Canker Project

01 Apr 2010

Bacterial canker has been an on-going problem for HNS growers for many years; it also causes losses to stone fruit growers. It is caused by either Pseudomonas syringae pv. morsprunorum (Psm) or P.s. pv. syringae (Pss). Psm is host specific to Prunus spp., whereas pv. syringae has a wide host range, with the potential for cross infection between a number of different species and genera. Although the stem canker phase is the most economically important, these pathogens may also cause leaf spots/shot-holes, shoot die-back and flower blights. The project aims to identify management options which will help in the control of bacterial canker, focusing on the elimination or reduction of primary inoculum on propagation nurseries.

Diversity of Xanthomonas from brassicas in Nepal

10 Feb 2010

A new scientific paper on the occurence and diveristy of Xanthomonas campestris pv. campestris (Xcc) in Nepal has been published in Plant Disease. The paper reports the results of race-typing and genetic fingerprinting of Xcc isolates from cabbage and cauliflower crops growing in Nepal. The work was a collaborative effort between Plant Health Solutions, and scientists at Warwick-HRI, Copenhagen University and the Nepal Agricultural Research Council. Read more Link to the full paper...

Brassica Conference 2010 Poster

19 Jan 2010

A copy of the poster on the current project on Disease Management in Organic Brassica Transplants is now available. The poster is due to be presented at the Brassica Growers Conference and Trade Exhibition in Lincoln, 19 Feb 2010. The poster presents details of the joint Warwick-HRI, Plant Health Solutions, Garden Organic project funded by HDC (Project No. FV 352). Click here to download poster...

XLII Brazilian Congress of Phytopathology

3-7 August 2009

Steve Roberts presented a keynote lecture on Eradication of seedborne plant pathogens at the XLII Brazilian Congress of Phytopathology. The conference is the the largest and most important plant pathology congress in South America and was attended by over 800 participants. It was held in Rio de Janerio, Brazil and promoted by the Brazilian Society of Phytopathology (SBF). More details can be found at Click on the link below to download a handout of the slides from the presentation. Download presentation handout (pdf)...

Disease management in organic brassica transplants

01 Jun 2009

A new project on disease management in organic brassica seed and transplants is being funded by the HDC. The two-year project will aim to evaluate a range of organically acceptable brassica seed and transplant treatments for their efficacy and cost effectiveness in controlling common soil and seed-borne diseases. The treatments tested will include microbial inoculants and suppressive composts that are currently available for use in the EU. It is anticipated that the work will benefit not only organic but also conventional plant raisers and growers by exploring alternative options for disease management that reduce disease levels and improve the quality of brassica transplants. The project number is FV 352 and will be a collaboration between Plant Health Solutions, Warwick-HRI and Garden Organic (HDRA)