Fungicide performance in wheat, barley and oilseed rape

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HGCA funding

The challenge

Foliar disease management in wheat, barley and oilseed rape continues to be challenging, with high disease pressure and unpredictable weather in recent years. In addition, changes in pathogen races continue to erode the effectiveness of leading azoles against Septoria, while the first signs of reduced sensitivity to azoles in the light leaf spot (LLS) pathogen and to SDHIs in some cereal diseases, are appearing. These challenges are developing against a background of continuing introduction of new products and activities by the plant protection industry.

The project

The project will continue on from the previous work looking at fungicide performance in wheat, barley and oilseed rape (OSR), providing an independent assessment of the relative performance of new and old fungicides against the economically important foliar diseases. However, important changes will be introduced to reflect changing cropping and disease pressures. In addition to septoria tritici, yellow rust and brown rust trials in wheat, an additional trial will look at the performance of fungicides against head blight and their impact on mycotoxins. The increasing incidence of LLS in oilseed rape in recent years and apparent shifts in pathogen sensitivity to azoles means that an additional LLS trial will be included, while powdery mildew in wheat and brown rust in barley will no longer be investigated. Fungicide treatments will provide a robust test to discriminate between the performances of products under high disease pressure. Challenges resulting from unreliable natural epidemics mean that wheat brown rust and head blight trials will be inoculated to give consistent results. An adapted experimental design to test the flexibility of the spray timing window against septoria tritici will be continued and developed, providing growers with insights into the consequences of sub-optimal spray timings.

The benefits

The information generated in this project will allow crop managers to use fungicides efficiently, according to disease pressures and developing resistance issues.

Related Publications

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