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Assessing the performance of currently available azole fungicide products against septoria tritici - PS2711

Septoria leaf blotch, caused by the fungus Septoria tritici, is the most important disease of wheat in the UK. None of the currently available commercial wheat cultivars are sufficiently resistant to Septoria leaf blotch to prevent large crop losses in seasons of high disease pressure. The primary disease control strategy therefore is, and has been for more than two decades, the programmed application of foliar fungicides. The mainstay of the armoury of fungicides against this disease is a group of fungicides belonging to the azole group. Most wheat crops in the UK receive 2 or 3 azole-based fungicide treatments per season.

The fungal population has, over the last 10 years, adapted to the continual exposure to this group of fungicides and is now less sensitive to this group of fungicides than when the fungicides were introduced. This poses problems for growers as higher doses need to be applied to achieve acceptable levels of control of septoria. It also poses problems for manufacturers as the performance of their products declines and may reach a point where label claims for control are no longer valid. This raises the issue with the Pesticide Safety Directorate who have a resposibility for the approval of label claims.

The project is designed to test the efficacy of all currently available azole fungicides in the UK against septoria leaf blotch. The products will be tested as 2-spray programmes at label doses in high disease pressure situations to determine their relative efficacies. This will give PSD independant information on the performance of all currently approved azole fungicide products. This information will allow PSD to review the current label claims for septoria control and will help when product approval is reviewed at re-registration.
1. To determine the relative efficacies of the 12 azole fungicides currently marketed in the UK for the control of Septoria tritici when applied in 2-spray programmes at label doses.

2. To compare this efficacy data with historic data on relative performance of azole fungicides from the HGCA-funded Appropriate Fungicide Dose experiments.

3. To compare 2-spray programme of azoles against S. tritici with results from single-spray treatments in the HGCA-funded Appropriate Fungicide Dose (azoles) experiments in 2006.
Project Documents
• Final Report : Assessing the performance of currently available azole fungicide products against septoria tritici   (238k)
Time-Scale and Cost
From: 2006

To: 2007

Cost: £30,000
Contractor / Funded Organisations
Arable Farming              
Cereal Production              
Crop Diseases              
Disease Control              
Disease Prevention              
Fungicide use              
Pesticide use              
Plant diseases              
Fields of Study
Pesticide Safety