Written by Jane
Mounting concerns about SDHI resistance combined with an unpredictable disease outlook are putting wheat fungicide strategies under closer scrutiny this spring. CPM finds out why. SDHIs have become a cornerstone of many T1 and T2 programmes over recent years, but signs of declining performance against the principle threat of Septoria tritici last season reinforce the need for spray regimes that avoid exacerbating resistance problems and prolong existing chemistry. Furthermore, the cold, wet winter and start to spring may have reduced early disease pressure, but cutting back early sprays unnecessarily risks allowing disease to establish and could put later applied chemistry under extra pressure. Cold weather only slows rust and septoria development and both diseases can soon reignite with the right conditions, so it remains hard to predict what pressure crops will be under once they reach growth stage 32 (T1) and flag leaf emergence (T2), says Hutchinsons technical development director, Dr David Ellerton. “At the moment pressure from rusts and mildew is lower than last season, but there’s a long way to go.” The decline in curative control from triazoles, and signs of similar issues starting to affect SDHIs puts greater emphasis on early sprays to protect crops throughout the growing…
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