Net form of net blotch (NFNB) is an important disease of barley and can cause significant yield losses. Researchers have detected a mutation in NFNB affecting Group 11 (Qol) fungicides in barley samples collected in South Australia. While the mutation has not been associated with paddock fungicide failure, the discovery means all three fungicide Mode of Action groups are now compromised in barley limiting the options for chemical control of NFNB outbreaks.

This fact sheet provides more information about the mutation and its implications. It also provides information to help growers manage NFNB through agronomic strategies to minimise disease pressure, including planting less susceptible varieties, rotating crops, and managing stubble and green bridge weeds to reduce inoculum.

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