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  • barberry carpet moth, citizen science, John Innes Centre, rust

Citizen science project ‘Barberry Rust Explorer’ takes multi-disciplinary approach to conservation

  • March 25, 2019
  • 11:55 am
Barberry Carpet Moth - credit Ian Hughes, Butterfly Conservation
Barberry Carpet Moth (photo: Ian Hughes, Butterfly Conservation)

The delicately patterned Barberry Carpet moth is one of England’s species most at threat of extinction, but its conservation could risk helping a devastating wheat disease to re-establish.

The Barberry Rust Explorer (BarbRE) program, a citizen science project being launched in Norfolk on 3rd April 2019, aims to see how the moth’s host plant common barberry (Berberis spp.) can be managed to secure the future of this rare moth. It also seeks to better understand the life cycle of the stem rust pathogen to protect cereals from future outbreaks.

Dr Diane Saunders from the John Innes Centre explains that wheat stem rust (Puccinia graminis f. sp. tritici) has the potential to infect 80% of the current UK wheat lines. It was thought to have been eradicated until 2013, when it was discovered on a single wheat plant in a field in Suffolk – the first sighting for 60 years. Although no further infections have been recorded in the UK, increased incidence of wheat stem rust disease in Western Europe since 2013 is worrying as most of our wheat species are susceptible.

Dr Saunders says: “Barberry helps the overwintering cycle for wheat stem rust. At the end of the crop season, stem rust can produce hardy teliospores that germinate in the spring and infect barberry. The barberry bush acts as a seasonal bridge and source of inoculum. As a result, the shrub was largely removed from hedgerows and this was thought to have broken the disease cycle.

Diane Saunders, John Innes Centre
Diane Saunders, John Innes Centre

“Understanding how rust strains diversify and being able to accurately identify the cereal-infecting forms is vital for future bio-security. This knowledge may also suggest alternative methods of disease control.”

BarbRE is encouraging people interested in conservation and farming to use the iNaturalist app to report the location of common barberry bushes; these can then be checked by the BarbRE team for stem rust infection. This location information will directly inform the development of risk models, which will be invaluable if wheat stem rust re-emerges in the UK.

This project will ultimately provide a better understanding of the potential disease threat and help protect our wheat crops, while finding ways to manage conservation of the threatened Barberry Carpet moth.

Mark Parsons of Butterfly Conservation comments that BarbRE is a good model for how volunteers, conservationists, scientists and farmers can work together to find solutions to environmental issues.

He says: “Common Barberry still occurs widely in the countryside and despite this there have been no wheat rust issues in recent times. However, while the Barberry Carpet moth is an endangered species, restricted to just a handful of sites in this country, we are still concerned about the potential risk from stem rust and the impact it could have on food security. By working together, we can reach a consensus on the best way to manage this complex issue and maintain part of our natural heritage, whilst also reducing any possible threat from stem rust.”

More details about the BarbRE project and the launch meeting – at 18.30 on 3rd April 2019 at John Innes Conference Centre, Norwich Research Park, Colney Ln, Norwich NR4 7UH – can be found on the website barbre.co.uk.

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