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Download PDF Septoria may have been atypically absent as a serious risk to many wheat crops last season, but that doesn’t mean it can be safely ignored. CPM assesses the disease that robs yield more than any other. As we increasingly grow new and more resistant varieties, the more we select for the isolates that are able to multiply on those varieties. By Mike Abram If ever there was a season that needed a silver lining, 2020 was it. And while in the grand scheme of things, the absence of septoria in many areas as a meaningful wheat disease was only a very tiny sliver of a silver lining, it did at least ease growers into the post-chlorothalonil era. This season will be the first where that multisite will no longer be available, after its use up ran out just before most flag leaf sprays were applied last season. “A lot of people don’t realise just how much protectant activity it brought to our programmes,” says Jonathan Blake, principal crop research scientist with ADAS. Septoria is the most damaging disease in wheat crops in the UK, he says. “That’s not because it always creates the largest yield loss, as yellow…
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