Weeds pose the greatest risk of crop loss for wheat and barley farmers, but the increased use of herbicides to kill these weeds has meant that certain species are now resistant to herbicide chemicals, recent research has found.
Researchers in New Zealand have assessed the risk of herbicide resistance in 101 weed species known to affect wheat and barley crops on Kiwi farms.
While most species (55) were considered to be low-risk of developing resistance, 30 were medium-risk, and 16 were considered high-risk.
The top ten scored weeds were:
Echinochloa crus-galli
Poa annua
Lolium multiflorum
Erigeron sumatrensis
Raphanus raphanistrum
Lolium perenne
Erigeron bonariensis
Avena fatua
Avena sterilis
Digitaria sanguinalis