Fungicides were applied to minus-disease plots at GS 31 and GS 39. Plus-disease plots were inoculated at seedling and mid-tillering stages using a conidial suspension in water applied as a spray. In South Australia, trials were located at Hart Field Site and Booleroo Centre. Treatments were replicated six times and were blocked by disease treatment, with plot size of 10m x 1.5m. Trials were a split-plot design with disease-inoculated plots (‘plus-disease’) and disease-controlled plots (‘minus-disease’) for each variety. Varieties and STB resistance ratings were as follows: LRPB Impala SVS, Calibre S, Scepter S, Razor CL Plus S, Hammer CL Plus MSS and LRPB Lancer MS. Ratings for stripe rust and powdery mildew were taken into consideration as well. Six varieties were selected based on their disease resistance ratings to STB. In 20, SARDI in conjunction with Agriculture Victoria and the GRDC have conducted field trials in low and medium rainfall zones to quantify yield losses in wheat varieties. Typically, yield losses are observed in the high rainfall zones (HRZ) of the state, but seasons such as 2022 were conducive to yield losses in low and medium rainfall zones (LRZ, MRZ respectively). The disease is spread via rain splash and infection on the top three leaves is a driving factor for yield loss. Septoria tritici blotch (STB) was prevalent across the state in 2022, with higher-than-average spring rainfall causing substantial disease development in some areas.
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