Links between soilborne pathogens, plant parasitic nematodes, farm management and biophysical constraints in a southern Australian rainfed cropping system

Context Rotations in rainfed farming systems of southwest Australia have shifted towards intensified cropping and it is necessary to reassess soilborne pathogens plant parasitic nematodes within this context. Aims We tested the hypothesis that these recent changes rotations agronomy altered efficacy with which reduce incidence common root nematodes. Methods tracked pathogen DNA soil severity crop damage 184 paddocks, over 6 years from 2010 2015, related farmer practices. Key results Overall, severe was rare, 72% samples showing no or only a trace 1% severely damaged. found reduction paddocks pasture resultant very low weed populations, combined early sowing, reduced persistence nematode pests. But some aspects management had opposite effect: high rates herbicide, increased frequency cereals canola at expense lupin N fertiliser use. Conclusions Current agronomic practices non-host crops appear be effective controlling populations should applied cautiously. Implications Studies such as link multiple productivity constraints, pests, weeds nutrients, are important understand sustainability current proposed production methods.