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Download PDF Predicting the onset of septoria has always been a challenge because it’s invisible during its latent phase. But a changing climate is possibly making fungicide decision-making even more difficult, discovers CPM. Once hyphae grow within the leaf, then even the most potent fungicides have little activity. By Lucy de la Pasture Last year proved to be another season of unusual weather. March turned out to be the fifth wettest on record, yet April was one of the driest. In the lead up to spring there’d been below average rainfall for most areas but when rain arrived in May and June, septoria pressure rocketed and many growers were caught unawares. That acceleration in septoria was recorded at the Bayer trials site at Callow in Herefordshire, where the company, with the help of Fera, is using some of the latest technology to register septoria DNA levels in the three leaves that contribute to yield in winter wheat. Leaf five showing higher levels of septoria on early versus later-drilled Graham. “The aim has been to detect the disease within the leaf during its latent phase – when symptoms aren’t visible – and look at the impact of variety resistance and…
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