Late in 1974, some Johnson grass plants were found in a maize crop in Hawkes Bay.
Johnson grass is one of the worst farmland weeds. Capable of rapid spread and of smothering crops. Its also a vector of Maize and sweetcorn viruses. -dwarf mosaic.
This NZ Jnl of Agriculture article describes the discovery of , characteristics of Sorgham halepense and actions taken to eliminate it and suggests methods of control.
Another article was written-The potential menace of Johnson grass and published in the NZ Journal of Agriculture. 1975
