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EPPO Workshop on Azole fungicides and Septoria leaf blotch control

Harpenden (GB), 2010-12-07/09

 

Introduction and Background

Symptoms of SeptoriaSeptoria leaf blotch (Mycosphaerella graminicola (anamorph Septoria tritici)) is one of the most important foliar diseases of wheat in many EPPO countries. It has built up resistance to different triazoles and other DeMethylation-Inhibitors (DMIs) which have been widely used in cereals since the early 1980s. Despite intensive use for more than 30 years, azoles (triazoles and imidazoles) still provide broad effective control in many areas. However, a clear reduction in field efficacy has been seen in several cases and recent developments, particularly in the area of molecular techniques, have shown a significant complexity in the triazoles resistance mechanisms. The implication of these findings could have a major impact on future recommendations and due to the significance of the problem an EPPO Workshop on azole fungicides and Septoria leaf blotch control, was held on 2010-12-07/09 at Rothamsted Research (Harpenden, GB).

Wheat fieldThe aim of the workshop was to bring together the latest scientific knowledge, agronomic practices and regulatory information to enable the development of best practice advice for management of Septoria resistance across the EPPO region. Because of the importance of triazoles in disease management, it provided a forum for obtaining a comprehensive overview of the triazoles resistance situation and for discussing the consequences for recommendations given by national authorities and the labelling of the products.

There were 70 participants from 12 EPPO countries (including delegates from research institutions, universities, national regulatory bodies, agricultural advisory organizations) and 9 agrochemical companies.

The Workshop was organized as a series of lectures with plenty of time for discussion. An overview of the workshop including all the workshop materials is presented below. 

 


List of lectures

Lecture Session I ‘Introduction to Septoria leaf blotch control’ [Chair: Bernd Rodemann]

 

Lecture Session II ‘Azole sensitivity monitoring of Septoria populations’ [Chair: Anne-Sophie Walker]

 

Lecture Session III ‘Scientific basis of azole resistance development’ [Chair: John Lucas]

 

Lecture Session IV ‘Fungicide resistance management strategies and practical use of azoles in European agriculture’ [Chair: Andy Leadbeater]

 

The following posters were presented:

A number of posters came from the ENDURE project:

Following two days of presentations, the workshop was divided into two Working Groups with the aim of consolidating the information and inputs into some general recommendations regarding the use of triazoles for Septoria control in the future. 

Working Group I. Understanding and assessing changes in sensitivity [Chair: John Lucas; Rapporteur: Gerrit Kema]
This topic included e.g. genetic resistance, monitoring methodologies, standard tests and nomenclature of isolates, efflux pumps, etc., risk for evolution of resistance to new chemistry (SDHI).

Working Group II. Strategies for management and communication of risk [Chair: Lise Nistrup Jørgensen; Rapporteur: David Richardson]
This topic included e.g. triazole mixtures, dose rates, inclusion of IPM and contribution from plant breeding, mixing with new chemistry, dissemination of information to farmers and advisors.

 

The conclusions and recommendations of both Working Groups are summarized in the Workshop Conclusions and Recommendations (see above).

 

 

Acknowledgements

The EPPO Secretariat wishes to thank all participants and particularly the following for their contribution and assistance with this workshop.

Rothamsted Research as local organizer
FRAC for supporting a welcome buffet
The Organizing Committee
All chairs, rapporteurs, speakers and poster presenters. 

 

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