Whitworth said that the wet conditions have caused potato crops to stay green and leafy - making "power hungry" work for flail choppers that results in high fuel costs and slow work rates.
He said: "There is also the real risk that chopping and spreading a thick mulch of green leaf in wet conditions may encourage tuber diseases, including blight and Blackleg (Erwinia).
"The ground is so wet that, in many instances, growers would be better to leave the flail in the shed and adopt a two-spray desiccation programme, to minimise wheelings and soil damage prior to harvest.
"If they need to flail, then a pre-flail Reglone treatment will reduce the volume of haulm to be chopped, speeding up the process and reducing costs by making the flail operation easier and more efficient."
He added that desiccation of the green leaf and stem also reduces any mulch left on the soil surface, which will cut the risk of disease developing.