IFA national potato committee vice-chairman Thomas Carpenter said: "This situation is a wipe out for growers who endured a very difficult season with low prices for their produce, rising input costs and the worst weather for years."
He added that, depending on how quickly temperatures rise and ground conditions improve, growers may find that they have no crop to harvest.
"The losses will result in a 20% drop in marketable produce and retailers must respond immediately by paying a viable price to producers for crop in store."
The IFA said the situation regarding crops such as Brussels sprouts, cauliflowers, carrots and celery was being monitored.
See the Horticulture Week picture gallery for winter scenes from across the country.