To assess efficacy of a promising new fungicide seed treatment (Tymirium – working name) in the process of being evaluated
for crown rot management. In addition to this, Elders Limited have advanced bread wheat lines with crown rot resistance levels which were assessed in these trials.

• The Syngenta Australia fungicide seed treatment (working name, Tymirium) improved yields of durum wheat, bread wheat and barley in the presence of crown rot.
• Yield improvements were greatest for durum wheat (VS) – 24%-32% and lower for bread wheat (MS-S) – 4%-29% and barley (S) – 7%.
• New Elders Limited bread wheat lines EDGE-19-SA-0178 and EDGE-19-SA-1098 improved crown rot resistance and yielded well in the presence of crown rot when compared with Trojan.
• Tymirium seed treatment reduced crown rot incidence (% main stems with basal browning), severity of basal stem browning and white head expression in durum and bread wheats and severity of basal stem browning in barley.
• Fungicide seed treatment and bread wheat varieties with improved resistance to crown rot (even if combined) will not eliminate crown rot inoculum carryover in the season they are used. However, it is likely that both management options will assist in managing crown rot inoculum levels in the medium to long-term, particularly where they are used together and where breaks from cereal are included in the rotation.