By Grant Hollaway (Department of Economic Development) and Stuart McColl (BCG)
- Yellow leaf spot reduced grain yield in susceptible wheat cultivars by eight per cent.
- When sowing into paddocks with yellow leaf spot infected wheat stubble, farmers should consider growing resistant cultivars in preference to susceptible cultivars.
Yellow leaf spot (YLS) of wheat has become more prevalent during the last 20 years due to the widespread adoption of cultivars that are YLS susceptible, the intensification of wheat in the cropping system (made possible due to CCN resistant cereals) and the adoption of stubble retention.
A trial was established at Quambatook in 2014 to determine the yield loss caused by YLS in wheat in the Victorian Mallee.
Yellow leaf spot was more severe in susceptible than in resistant varieties and in those plots with infected wheat stubble than those with uninfected barley stubble.
Even though there was a good establishment of YLS early in the season, the disease did not progress well during the dry spring, limiting the potential for further disease development and effects on grain yield.