Cereals present a tall, thin target. Syngenta cereal fungicides are robust and work well when applied as coarse sprays and at reduced volumes. Patchy weed control most usually comes from patchy application, due to the wrong choice of nozzle and drift.

For grassweed control in oilseed rape, operators face the extra problem of crop shading emerging target seedlings - the best rates of control are achieved by early applications at the one to two leaf stage.

Broad-leaved crops present a completely different target to cereals, with horizontal leaves interlocking into a closed canopy.

Raising the boom height further does little to alleviate problems with coverage but increase the potential for herbicide drift.

Recommendations vary depending on the size of the crop at the time of application.