Second SDHI for winter barley expected the first week of April, in some forward crops disease could be well established by the time we get to the awns stage.” Ideally he likes to use prothioconazole with differing modes of action but believes that may not be possible this season. “Prothioconazole is the stand out barley azole and in co-forms with bixafen there is nothing stronger. With the need to protect tillers and get on top of disease the T1 is the key timing, so a product like SiltraXpro is the logical choice. “Usually I would target an SDHI at the T1 and come back in with a prothioconazole mix. Strobs, spiroxamine, cyprodinil and chlorothalonil all have a place in barley disease control and provide an opportunity to use an alternative to an SDHI partner. However this year if rhynchosporium and ramularia develop too we could need a very potent mix. Regardless of product choice and rate I will be including CTL as further protection against ramularia.” Peter Cowlrick of CCC Ltd is
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Cassia in particular has been hard hit by mildew.
keeping a close eye on winter barley crops in Hampshire and Sussex and shares Mr Stephenson’s concerns with rust and mildew. His worry is that stress could exacerbate severity in winter barley crops with below average rainfall this spring and day night temperature fluctuations. “Some of the more brown rust susceptible varieties such as Volume are showing the disease.” He agrees winter barley could require a second SDHI application plus a morpholine or strobilurin to offer further protection against mildew and/or rust. “The
disease is still developing in canopies particularly in sheltered spots. I wouldn’t rule out some crops needing something like Talius (proquinazid), even with prothioconazole products like SiltraXpro,” he concludes.
Winter barley crops could require a follow up SDHI say AICC agronomists. After a lengthy dry spell dry diseases are to the fore – T1 sprays targeting brown rust and mildew over the usual culprit rhynchosporium. Patrick Stephenson expects a second SDHI application for winter barley T2 sprays. It is the six-row and hybrid varieties that he is most concerned about. “These really moved on at the start of April. Brown rust and mildew ratings don’t vary significantly between two- and sixtypes but it's the latter that appears to have taken the brunt of brown rust and mildew infection. Cassia in particular has been hard hit by mildew. “There is also a geographic issue. Northern areas are normally earmarked for a T0 to guard against rhynchsporium, but that isn’t necessarily the response further south. With the disease less of a concern it is no surprise that growers will have held off until the T1. But for any application timing is critical, and with leaf two emerging around
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