Manage your Septoria resistance
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Nufarm Warbler triazole sensitivity work 2006
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Spring 2007 saw the launch of Warbler, a new prochloraz based fungicide from Nufarm and the beginning of a large expansion in the Nufarm range of cereal fungicides
Triazole type fungicides have been around for over 25 years. They are still a very important weapon in our armoury against many important cereal diseases. Over the years, many strains of fungal diseases have become less sensitive to triazoles.
In 2006 Nufarm carried out a study on sensitivity of Septoria tritici to triazoles. Results showed there has been a shift in sensitivity. Many triazoles may not be controlling Septoria as well as they used to. Work sponsored by Nufarm has shown prochloraz (Warbler) appears to control strains of Septoria which have become less sensitive to other triazoles.
A full article was published in Crop protection Monthly. To download this article click the link below.
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Triazoles on trial article Crop Protection Monthly (PDF 44KB)
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Nufarm's new fungicide Grail. Latest results 2007
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This spring will see the introduction of Grail. A new cereal fungicide from Nufarm. Grail containis two actives, prochloraz and tebuconazole and was used to put Nufarm's sensitivity theory to the test in spring 2007. According to Nufarm's theory, the prochloraz in Grail will control Septoria strains which had become less sensitive to the tebuconazole component in Grail
If the theory is correct you would expect improved disease control resulting in yield responses over and above the two actives when used separately. This is exactly what happened. See graph below
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Trial at HAUC 2007- Yield response from a T1 + T2 programme
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 This trial showed a statistically significant yield response from Grail over its component parts, prochloraz (Warbler) and tebuconazole (Mystique). The predominant disease was Septoria. If you add the two components togther you get a yield increase of 1.2 tonnes/ha. Grail gave 1.4 tonnes/ha, even more than prochloraz and tebuconazole combined
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Nufarm recommendation for Septoria resistance management
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We have seen what over-reliance on just one fungicide active can do. Septoria is now effectively resistant to the stobilurin group of chemicals. Triazole insensitivity is increasing but some actives are still performing well. Nufarm advice is never to rely on one triazole. Grail and Warbler containing prochloraz are both ideal T1 products and may help manage resistance but always alternate triazoles and use other non-triazole actives such as chlorothalonil.
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Warbler contains prochloraz, Grail contains prochloraz and tebuconazole. Always read the label: use pesticides safely
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