Yield loss data is often generated by comparing trial plots with high disease levels and plots with no disease. Yield loss figures are then calculated based upon potential yield loss as a percentage of maximum yield in a susceptible variety. In an on-farm situation, disease pressure is more likely to come somewhere between these two extremes. Yield loss varies between seasons, disease epidemics and varieties.
Researchers from DAFQ are running trials to try and fill these gaps and develop yield loss response curves. Disease yield loss response curves provide a summary of how a variety performs against varying levels of disease. Filling the gaps will assist growers and advisors in variety choice and disease management decision making under variable disease epidemics. Greg Platz explains yield loss response curves and their preliminary findings.
To find out more about barley disease yield loss response curves read the full GRDC Updates Paper: How much yield is lost in varieties with different levels of genetic resistance under different disease pressures?
This GRDC funded project “Yield loss response curves for host resistance to leaf, crown and root diseases in wheat and barley” is led by researchers at DAF QLD. GRDC Project code DAW00245.
You can access all the 2017 GRDC cereal disease update papers from our article Latest on Cereal disease – 2017 GRDC Update Papers.
Clayton Forknall, DAFQ
Lisle Snyman, DAFQ