Barnyardgrass (Echinochloa crus-galli) is an invasive plant of Tropical Asia. It was first detected in Great Lakes Region in 1843.
Considered one of the world's worst weeds, it reduces crop yields and causes forage crops to fail by removing up to 80% of the available soil nitrogen. The high levels of nitrates it accumulates can poison livestock. It acts as a host for several mosaic virus diseases. Heavy infestations can interfere with mechanical harvesting.