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Triazole resistance found in Australian barley

The Australian Grains Research and Development Corporation (GRDC) has cautioned barley growers about the risks of fungicide resistance. The warning follows the identification of a strain of powdery mildew ( Blumeria graminis hordei) resistant to the triazole fungicide, tebuconazole. It is the first case of resistance to a fungicide in an arable crop in Australia, the GRDC points out. The resistant strain was found in Western Australia, where the performance of older triazoles has been questioned in recent years. The GRDC recommends the use of newer triazoles and fungicides with alternative modes of action.



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